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15-(4x+5)=7x-105
We move all terms to the left:
15-(4x+5)-(7x-105)=0
We get rid of parentheses
-4x-7x-5+105+15=0
We add all the numbers together, and all the variables
-11x+115=0
We move all terms containing x to the left, all other terms to the right
-11x=-115
x=-115/-11
x=10+5/11
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