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20=2(y+4)-4y
We move all terms to the left:
20-(2(y+4)-4y)=0
We calculate terms in parentheses: -(2(y+4)-4y), so:We get rid of parentheses
2(y+4)-4y
We add all the numbers together, and all the variables
-4y+2(y+4)
We multiply parentheses
-4y+2y+8
We add all the numbers together, and all the variables
-2y+8
Back to the equation:
-(-2y+8)
2y-8+20=0
We add all the numbers together, and all the variables
2y+12=0
We move all terms containing y to the left, all other terms to the right
2y=-12
y=-12/2
y=-6
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