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4x+3(4x+13)=215
We move all terms to the left:
4x+3(4x+13)-(215)=0
We multiply parentheses
4x+12x+39-215=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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