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2(x)+3(x-30)=65
We move all terms to the left:
2(x)+3(x-30)-(65)=0
We multiply parentheses
2x+3x-90-65=0
We add all the numbers together, and all the variables
5x-155=0
We move all terms containing x to the left, all other terms to the right
5x=155
x=155/5
x=31
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