Solve for x
x=0.125
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-0.5+0.8x=-0.4
Swap sides so that all variable terms are on the left hand side.
0.8x=-0.4+0.5
Add 0.5 to both sides.
0.8x=0.1
Add -0.4 and 0.5 to get 0.1.
x=\frac{0.1}{0.8}
Divide both sides by 0.8.
x=\frac{1}{8}
Expand \frac{0.1}{0.8} by multiplying both numerator and the denominator by 10.
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