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13x+3.6=7x-8.4
We move all terms to the left:
13x+3.6-(7x-8.4)=0
We get rid of parentheses
13x-7x+8.4+3.6=0
We add all the numbers together, and all the variables
6x+12=0
We move all terms containing x to the left, all other terms to the right
6x=-12
x=-12/6
x=-2
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