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5x+4(2x-10)=12
We move all terms to the left:
5x+4(2x-10)-(12)=0
We multiply parentheses
5x+8x-40-12=0
We add all the numbers together, and all the variables
13x-52=0
We move all terms containing x to the left, all other terms to the right
13x=52
x=52/13
x=4
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