Question

(y+4)-(y-1)=6; (13x-15)-(9+6x)=-3; 1,6x-(x-2,8)=(0,2x+1,5)-0,7

Answer 1

у+4-у+1=6у
5=6у
у=5÷6
у=5/6

13х-15-9-6х=-3х
7х-24=-3х
7х+3х=24
10х=24
х=24÷10
х=2.4

1.6х-х+2.8=0.2х+1.5-0.7
0.6х+2.8=0.2х+0.8
0.6х-0.2х=0.8-2.8
0.4х=-2
х=-2÷0.4
х=-5