Solve for d
d=-2
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-4\times 10+10\times 9d=-220
Multiply both sides of the equation by 2.
-40+10\times 9d=-220
Multiply -4 and 10 to get -40.
-40+90d=-220
Multiply 10 and 9 to get 90.
90d=-220+40
Add 40 to both sides.
90d=-180
Add -220 and 40 to get -180.
d=\frac{-180}{90}
Divide both sides by 90.
d=-2
Divide -180 by 90 to get -2.
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