Question

Me ajudem nessas contas:
9x+15=2
2x+5=25
4y+56=-20
10x=x-180

Answer 1

9x+15=2
9x= -15+2
9x = -13
x = -13/9

2x+5=25
2x= 25-5
2x= 20
x= 10

4y+56= -20
4y=-56-20
4y= -76
y= -76/4
y= 19

10x= x-180
10x-x = -180
9x = -180
x= -180/9
x= -20