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2x+7(4x-40)=-10
We move all terms to the left:
2x+7(4x-40)-(-10)=0
We add all the numbers together, and all the variables
2x+7(4x-40)+10=0
We multiply parentheses
2x+28x-280+10=0
We add all the numbers together, and all the variables
30x-270=0
We move all terms containing x to the left, all other terms to the right
30x=270
x=270/30
x=9
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