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-12.9x-3.1=56-9.9x
We move all terms to the left:
-12.9x-3.1-(56-9.9x)=0
We add all the numbers together, and all the variables
-12.9x-(-9.9x+56)-3.1=0
We get rid of parentheses
-12.9x+9.9x-56-3.1=0
We add all the numbers together, and all the variables
-3x-59.1=0
We move all terms containing x to the left, all other terms to the right
-3x=59.1
x=59.1/-3
x=-19+2.1/3
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