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8.40x=7x+14
We move all terms to the left:
8.40x-(7x+14)=0
We get rid of parentheses
8.40x-7x-14=0
We add all the numbers together, and all the variables
1.4x-14=0
We move all terms containing x to the left, all other terms to the right
1.4x=14
x=14/1.4
x=10
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