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150=72+6x
We move all terms to the left:
150-(72+6x)=0
We add all the numbers together, and all the variables
-(6x+72)+150=0
We get rid of parentheses
-6x-72+150=0
We add all the numbers together, and all the variables
-6x+78=0
We move all terms containing x to the left, all other terms to the right
-6x=-78
x=-78/-6
x=+13
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