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2x+3x+4x=76.5
We move all terms to the left:
2x+3x+4x-(76.5)=0
We add all the numbers together, and all the variables
9x-76.5=0
We move all terms containing x to the left, all other terms to the right
9x=76.5
x=76.5/9
x=8+3/6
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