Solve for x
x=30
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0.85x+4-x=-0.5
Subtract x from both sides.
-0.15x+4=-0.5
Combine 0.85x and -x to get -0.15x.
-0.15x=-0.5-4
Subtract 4 from both sides.
-0.15x=-4.5
Subtract 4 from -0.5 to get -4.5.
x=\frac{-4.5}{-0.15}
Divide both sides by -0.15.
x=\frac{-450}{-15}
Expand \frac{-4.5}{-0.15} by multiplying both numerator and the denominator by 100.
x=30
Divide -450 by -15 to get 30.
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