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15=11x+1+3x
We move all terms to the left:
15-(11x+1+3x)=0
We add all the numbers together, and all the variables
-(14x+1)+15=0
We get rid of parentheses
-14x-1+15=0
We add all the numbers together, and all the variables
-14x+14=0
We move all terms containing x to the left, all other terms to the right
-14x=-14
x=-14/-14
x=1
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