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2(5-y)=-20
We move all terms to the left:
2(5-y)-(-20)=0
We add all the numbers together, and all the variables
2(-1y+5)-(-20)=0
We add all the numbers together, and all the variables
2(-1y+5)+20=0
We multiply parentheses
-2y+10+20=0
We add all the numbers together, and all the variables
-2y+30=0
We move all terms containing y to the left, all other terms to the right
-2y=-30
y=-30/-2
y=+15
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