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18(x-5)-20(x-5)=-12
We move all terms to the left:
18(x-5)-20(x-5)-(-12)=0
We add all the numbers together, and all the variables
18(x-5)-20(x-5)+12=0
We multiply parentheses
18x-20x-90+100+12=0
We add all the numbers together, and all the variables
-2x+22=0
We move all terms containing x to the left, all other terms to the right
-2x=-22
x=-22/-2
x=+11
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