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(4x+5)*3=51
We move all terms to the left:
(4x+5)*3-(51)=0
We multiply parentheses
12x+15-51=0
We add all the numbers together, and all the variables
12x-36=0
We move all terms containing x to the left, all other terms to the right
12x=36
x=36/12
x=3
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