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2x+7x=33+12
We move all terms to the left:
2x+7x-(33+12)=0
We add all the numbers together, and all the variables
2x+7x-45=0
We add all the numbers together, and all the variables
9x-45=0
We move all terms containing x to the left, all other terms to the right
9x=45
x=45/9
x=5
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