Verified answer

1. (х+1)*40=45х  

40x+40=45x

5x=40

x=8
2. 2.5х+4=4*(х-2)

2.5x+4=4x-8

1.5x=12

x=8
3. (х+10)*9=(х-2)*11

9x+90=11x-22

2x=112

x=56

1. 40x+40-45x=0

5x=40

x=8

2. 2,5x+4-4x+8=0

1,5x+12=0

1,5x=-12

x=-8

3. 9x+90-11x+22=0

-2x+112=0

2x=112

x=56