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7x+5x=3.6
We move all terms to the left:
7x+5x-(3.6)=0
We add all the numbers together, and all the variables
12x-3.6=0
We move all terms containing x to the left, all other terms to the right
12x=3.6
x=3.6/12
x=1/3.3333333333333
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