Решите уравнения : 1) 7 * ( х + 8 ) - 25 = 66 2) 9 * ( 5х +13 ) = 252 3) 15 * ( 13х - 7 ) = 285 4) ( у + 46 ) / 3 = 18 5) ( 2х + 39 ) / 5 = 13 6) 182 / ( х - 15 ) = 14

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вопрос

1) 7(x + 8) - 25 = 66
7x + 56 - 25 = 66
7x + 31 = 66
7x = 66 - 31
7x = 35
x = 35/7
x = 5

2) 9(5x + 13) = 252
45x + 117 = 252
45x = 252 - 117
45x = 135
x = 135/45
x = 3

3) 15(13x - 7) = 285
195x - 105 = 285
195x = 285 + 105
195x = 390
x = 390/195
x = 2

4) (y + 46)/3 = 18
y + 46 = 3 * 18
y + 46 = 54
y = 54 - 46
y = 8

5) (2x + 39)/5 = 13
2x + 39 = 5 * 13
2x + 39 = 65
2x = 65 - 39
2x = 26
x = 26/2
x = 13

6) 182/(x - 15) = 14
182 = 14(x - 15)
182 = 14x - 210
14x = 182 + 210
14x = 392
x = 392/14
x = 28