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12x-1.4=6+3x
We move all terms to the left:
12x-1.4-(6+3x)=0
We add all the numbers together, and all the variables
12x-(3x+6)-1.4=0
We get rid of parentheses
12x-3x-6-1.4=0
We add all the numbers together, and all the variables
9x-7.4=0
We move all terms containing x to the left, all other terms to the right
9x=7.4
x=7.4/9
x=5.2857142857143/6.4285714285714
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