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12+6.4x=-4.5+11.9x
We move all terms to the left:
12+6.4x-(-4.5+11.9x)=0
We add all the numbers together, and all the variables
6.4x-(11.9x-4.5)+12=0
We get rid of parentheses
6.4x-11.9x+4.5+12=0
We add all the numbers together, and all the variables
-5.5x+16.5=0
We move all terms containing x to the left, all other terms to the right
-5.5x=-16.5
x=-16.5/-5.5
x=+3
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