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155=11.25x+20
We move all terms to the left:
155-(11.25x+20)=0
We get rid of parentheses
-11.25x-20+155=0
We add all the numbers together, and all the variables
-11.25x+135=0
We move all terms containing x to the left, all other terms to the right
-11.25x=-135
x=-135/-11.25
x=+12
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