Решите уравнение 1) 9x+(7x+5)-(2x-3)=x+7 2) 3x-(8+9x)-(5x-4)=-7x 3)x-15,5+8x-(13x+16,5)=12x 4) 6x-(2x+13)-(x-7)=15x
1) 9x+(7x+5)-(2x-3)=x+7
9х+7х+5-2х+3=х+7
14х+8=х+7
14х-х= 7-8
13х=-1
х= -1/13
2) 3x-(8+9x)-(5x-4)=-7x
3х-8-9х-5х+4=-7х
-11х-4=-7х
11х-7х=-4
3х=-4
х=-4/3
3)x-15,5+8x-(13x+16,5)=12x
х-15,5+8х-13х-16,5=12х
-4х-32=12х
12х+4х=-32
16х=-32
х=-32/16
х=-2
4) 6x-(2x+13)-(x-7)=15x
6х-2х-13-х+7=15х
3х-6=15х
15х-3х=-6
12х=-6
х=-6/12
х=-1/2