150 - x : 2 = 140150 - x = 140 * 2150 - x = 280-x = 280 - 150-x = 130x = -130
(150 - x) : 2 = 65150 - x = 65 * 2150 - x = 130-x = 130 - 150-x = -20x = 20
(300 - 18) x = 1410282 x = 1410x = 1410 / 282x = 5
5x - 600 = 9005x = 900 + 6005x = 1500x = 1500 / 5x = 300
300 - x * 5 = 210300 - 5x = 210-5x = 210 - 300-5x = -90x = -90 / -5x = 18
(300 - x) * 5 = 210300 - x = 210 / 5300 - x = 42-x = 42 - 300-x = -258x = 258
(150 - 20) : x = 65130 : x = 65x = 130 / 65x = 2
(x + 4) * 7 = 3507x + 28 = 3507x = 350 - 287x = 322x = 322 / 7x = 46
Таким образом, решения уравнений:
150 - x : 2 = 140
150 - x = 140 * 2
150 - x = 280
-x = 280 - 150
-x = 130
x = -130
(150 - x) : 2 = 65
150 - x = 65 * 2
150 - x = 130
-x = 130 - 150
-x = -20
x = 20
(300 - 18) x = 1410
282 x = 1410
x = 1410 / 282
x = 5
5x - 600 = 900
5x = 900 + 600
5x = 1500
x = 1500 / 5
x = 300
300 - x * 5 = 210
300 - 5x = 210
-5x = 210 - 300
-5x = -90
x = -90 / -5
x = 18
(300 - x) * 5 = 210
300 - x = 210 / 5
300 - x = 42
-x = 42 - 300
-x = -258
x = 258
(150 - 20) : x = 65
130 : x = 65
x = 130 / 65
x = 2
(x + 4) * 7 = 350
7x + 28 = 350
7x = 350 - 28
7x = 322
x = 322 / 7
x = 46
Таким образом, решения уравнений:
x = -130x = 20x = 5x = 300x = 18x = 258x = 2x = 46