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2(2x-10)+(3x-10)=90
We move all terms to the left:
2(2x-10)+(3x-10)-(90)=0
We multiply parentheses
4x+(3x-10)-20-90=0
We get rid of parentheses
4x+3x-10-20-90=0
We add all the numbers together, and all the variables
7x-120=0
We move all terms containing x to the left, all other terms to the right
7x=120
x=120/7
x=17+1/7
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