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5x+3(x+10)=78
We move all terms to the left:
5x+3(x+10)-(78)=0
We multiply parentheses
5x+3x+30-78=0
We add all the numbers together, and all the variables
8x-48=0
We move all terms containing x to the left, all other terms to the right
8x=48
x=48/8
x=6
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