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9x+15=150-9x
We move all terms to the left:
9x+15-(150-9x)=0
We add all the numbers together, and all the variables
9x-(-9x+150)+15=0
We get rid of parentheses
9x+9x-150+15=0
We add all the numbers together, and all the variables
18x-135=0
We move all terms containing x to the left, all other terms to the right
18x=135
x=135/18
x=7+1/2
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