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4(1+4x)=84
We move all terms to the left:
4(1+4x)-(84)=0
We add all the numbers together, and all the variables
4(4x+1)-84=0
We multiply parentheses
16x+4-84=0
We add all the numbers together, and all the variables
16x-80=0
We move all terms containing x to the left, all other terms to the right
16x=80
x=80/16
x=5
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