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-242+8x=103-15x
We move all terms to the left:
-242+8x-(103-15x)=0
We add all the numbers together, and all the variables
8x-(-15x+103)-242=0
We get rid of parentheses
8x+15x-103-242=0
We add all the numbers together, and all the variables
23x-345=0
We move all terms containing x to the left, all other terms to the right
23x=345
x=345/23
x=15
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