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2x+3x+4x+6x+7x+2=78
We move all terms to the left:
2x+3x+4x+6x+7x+2-(78)=0
We add all the numbers together, and all the variables
22x-76=0
We move all terms containing x to the left, all other terms to the right
22x=76
x=76/22
x=3+5/11
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