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3(4x+2)+4(2x+1)=50
We move all terms to the left:
3(4x+2)+4(2x+1)-(50)=0
We multiply parentheses
12x+8x+6+4-50=0
We add all the numbers together, and all the variables
20x-40=0
We move all terms containing x to the left, all other terms to the right
20x=40
x=40/20
x=2
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