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15+90=(15x)+(15x)
We move all terms to the left:
15+90-((15x)+(15x))=0
We add all the numbers together, and all the variables
-(+30x)+15+90=0
We add all the numbers together, and all the variables
-(+30x)+105=0
We get rid of parentheses
-30x+105=0
We move all terms containing x to the left, all other terms to the right
-30x=-105
x=-105/-30
x=3+1/2
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