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15=2x+3x-1
We move all terms to the left:
15-(2x+3x-1)=0
We add all the numbers together, and all the variables
-(5x-1)+15=0
We get rid of parentheses
-5x+1+15=0
We add all the numbers together, and all the variables
-5x+16=0
We move all terms containing x to the left, all other terms to the right
-5x=-16
x=-16/-5
x=3+1/5
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