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(5+7y)*15=-30
We move all terms to the left:
(5+7y)*15-(-30)=0
We add all the numbers together, and all the variables
(7y+5)*15-(-30)=0
We add all the numbers together, and all the variables
(7y+5)*15+30=0
We multiply parentheses
105y+75+30=0
We add all the numbers together, and all the variables
105y+105=0
We move all terms containing y to the left, all other terms to the right
105y=-105
y=-105/105
y=-1
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