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3x+4(x+10)=75
We move all terms to the left:
3x+4(x+10)-(75)=0
We multiply parentheses
3x+4x+40-75=0
We add all the numbers together, and all the variables
7x-35=0
We move all terms containing x to the left, all other terms to the right
7x=35
x=35/7
x=5
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