Question

efetue e arme a conta :

12y-5=4-8y

20y+9=2-15y

21y+3=13-6y

8y+50=21-34y

Answer 1

12y-5=4-8y
12y+8y=4+5
20y=9
y=9/20
y=0.45

20y+9=2-15y
20y+15y=2-9
35y=-7
y=-7/35
y=-0.2

21y+3=13-6y
21y+6y=13-3
27y=10
y=10/27
y=0.3703703704

8y+50=21-34y
8y+34y=21-50
42y=-29
y=-29/42
y=-0.6904761905