Solve for d
d=-1
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d\times 7+4=3d
Variable d cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by d.
d\times 7+4-3d=0
Subtract 3d from both sides.
4d+4=0
Combine d\times 7 and -3d to get 4d.
4d=-4
Subtract 4 from both sides. Anything subtracted from zero gives its negation.
d=\frac{-4}{4}
Divide both sides by 4.
d=-1
Divide -4 by 4 to get -1.
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