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4(2x+5)=-4x-28
We move all terms to the left:
4(2x+5)-(-4x-28)=0
We multiply parentheses
8x-(-4x-28)+20=0
We get rid of parentheses
8x+4x+28+20=0
We add all the numbers together, and all the variables
12x+48=0
We move all terms containing x to the left, all other terms to the right
12x=-48
x=-48/12
x=-4
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