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3.4x-12=5.9x+3
We move all terms to the left:
3.4x-12-(5.9x+3)=0
We get rid of parentheses
3.4x-5.9x-3-12=0
We add all the numbers together, and all the variables
-2.5x-15=0
We move all terms containing x to the left, all other terms to the right
-2.5x=15
x=15/-2.5
x=-6
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