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5x-3(x+4)=18
We move all terms to the left:
5x-3(x+4)-(18)=0
We multiply parentheses
5x-3x-12-18=0
We add all the numbers together, and all the variables
2x-30=0
We move all terms containing x to the left, all other terms to the right
2x=30
x=30/2
x=15
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