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3.6=2x+-18
We move all terms to the left:
3.6-(2x+-18)=0
We add all the numbers together, and all the variables
-(2x-18)+3.6=0
We get rid of parentheses
-2x+18+3.6=0
We add all the numbers together, and all the variables
-2x+21.6=0
We move all terms containing x to the left, all other terms to the right
-2x=-21.6
x=-21.6/-2
x=10+1/1.25
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