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2x-5(2x+12)=-20
We move all terms to the left:
2x-5(2x+12)-(-20)=0
We add all the numbers together, and all the variables
2x-5(2x+12)+20=0
We multiply parentheses
2x-10x-60+20=0
We add all the numbers together, and all the variables
-8x-40=0
We move all terms containing x to the left, all other terms to the right
-8x=40
x=40/-8
x=-5
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