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4x+2*6x=84
We move all terms to the left:
4x+2*6x-(84)=0
Wy multiply elements
4x+12x-84=0
We add all the numbers together, and all the variables
16x-84=0
We move all terms containing x to the left, all other terms to the right
16x=84
x=84/16
x=5+1/4
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