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3(2x+x)=36
We move all terms to the left:
3(2x+x)-(36)=0
We add all the numbers together, and all the variables
3(+3x)-36=0
We multiply parentheses
9x-36=0
We move all terms containing x to the left, all other terms to the right
9x=36
x=36/9
x=4
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