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3x+2(x-10)=9x+4
We move all terms to the left:
3x+2(x-10)-(9x+4)=0
We multiply parentheses
3x+2x-(9x+4)-20=0
We get rid of parentheses
3x+2x-9x-4-20=0
We add all the numbers together, and all the variables
-4x-24=0
We move all terms containing x to the left, all other terms to the right
-4x=24
x=24/-4
x=-6
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