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x(0.4)+x=12
We move all terms to the left:
x(0.4)+x-(12)=0
We add all the numbers together, and all the variables
x+x(0.4)-12=0
We multiply parentheses
x+0.4x-12=0
We add all the numbers together, and all the variables
1.4x-12=0
We move all terms containing x to the left, all other terms to the right
1.4x=12
x=12/1.4
x=8+0.8/1.4
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