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6x+2+8x+6+7x+4=90
We move all terms to the left:
6x+2+8x+6+7x+4-(90)=0
We add all the numbers together, and all the variables
21x-78=0
We move all terms containing x to the left, all other terms to the right
21x=78
x=78/21
x=3+5/7
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