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135=x*90
We move all terms to the left:
135-(x*90)=0
We add all the numbers together, and all the variables
-(+x*90)+135=0
We get rid of parentheses
-x*90+135=0
Wy multiply elements
-90x+135=0
We move all terms containing x to the left, all other terms to the right
-90x=-135
x=-135/-90
x=1+1/2
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