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4x-5(4x+10)=126
We move all terms to the left:
4x-5(4x+10)-(126)=0
We multiply parentheses
4x-20x-50-126=0
We add all the numbers together, and all the variables
-16x-176=0
We move all terms containing x to the left, all other terms to the right
-16x=176
x=176/-16
x=-11
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