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2x+3(x-45)=540
We move all terms to the left:
2x+3(x-45)-(540)=0
We multiply parentheses
2x+3x-135-540=0
We add all the numbers together, and all the variables
5x-675=0
We move all terms containing x to the left, all other terms to the right
5x=675
x=675/5
x=135
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