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240=6x+5+4x+15
We move all terms to the left:
240-(6x+5+4x+15)=0
We add all the numbers together, and all the variables
-(10x+20)+240=0
We get rid of parentheses
-10x-20+240=0
We add all the numbers together, and all the variables
-10x+220=0
We move all terms containing x to the left, all other terms to the right
-10x=-220
x=-220/-10
x=+22
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