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8.4x-2.6=31
We move all terms to the left:
8.4x-2.6-(31)=0
We add all the numbers together, and all the variables
8.4x-33.6=0
We move all terms containing x to the left, all other terms to the right
8.4x=33.6
x=33.6/8.4
x=4
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