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115=3x+19+5x
We move all terms to the left:
115-(3x+19+5x)=0
We add all the numbers together, and all the variables
-(8x+19)+115=0
We get rid of parentheses
-8x-19+115=0
We add all the numbers together, and all the variables
-8x+96=0
We move all terms containing x to the left, all other terms to the right
-8x=-96
x=-96/-8
x=+12
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