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5(2x+3)=3(3+12)
We move all terms to the left:
5(2x+3)-(3(3+12))=0
We add all the numbers together, and all the variables
5(2x+3)-(315)=0
We add all the numbers together, and all the variables
5(2x+3)-315=0
We multiply parentheses
10x+15-315=0
We add all the numbers together, and all the variables
10x-300=0
We move all terms containing x to the left, all other terms to the right
10x=300
x=300/10
x=30
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