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5(3+2x)=75
We move all terms to the left:
5(3+2x)-(75)=0
We add all the numbers together, and all the variables
5(2x+3)-75=0
We multiply parentheses
10x+15-75=0
We add all the numbers together, and all the variables
10x-60=0
We move all terms containing x to the left, all other terms to the right
10x=60
x=60/10
x=6
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