3х - (х+17)=21
3х-х-17=21
3х-х=21+17
2х=38
х=19
4 -2(п+7)=2п - 2(п+3)
4-2п-14=2п-2п+6
-2п-2п+2п=6-4+14
-2п=16
п=-8
2.4x-7.6=-8(1.2x+5)
2.4x – 7.6 = – 9.6x – 40
2,4x + 9,6x = – 40 + 7,6
12x = -32.4
x = -2.7
x-7+5(3,6-2(x -3))= -1
раскроем скобки
x-7+18-10x+30 = -1
-9x+42 = 0
9x-42 = 0
9x = 42
x = 42/9
х=4,66666666667
3х - (х+17)=21
3х-х-17=21
3х-х=21+17
2х=38
х=19
4 -2(п+7)=2п - 2(п+3)
4-2п-14=2п-2п+6
-2п-2п+2п=6-4+14
-2п=16
п=-8
2.4x-7.6=-8(1.2x+5)
2.4x – 7.6 = – 9.6x – 40
2,4x + 9,6x = – 40 + 7,6
12x = -32.4
x = -2.7
x-7+5(3,6-2(x -3))= -1
раскроем скобки
x-7+18-10x+30 = -1
-9x+42 = 0
9x-42 = 0
9x = 42
x = 42/9
х=4,66666666667