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2x+3x=28+12
We move all terms to the left:
2x+3x-(28+12)=0
We add all the numbers together, and all the variables
2x+3x-40=0
We add all the numbers together, and all the variables
5x-40=0
We move all terms containing x to the left, all other terms to the right
5x=40
x=40/5
x=8
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