30=70-d

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Solution for 30=70-d equation:


Simplifying
30 = 70 + -1d

Solving
30 = 70 + -1d

Solving for variable 'd'.

Move all terms containing d to the left, all other terms to the right.

Add 'd' to each side of the equation.
30 + d = 70 + -1d + d

Combine like terms: -1d + d = 0
30 + d = 70 + 0
30 + d = 70

Add '-30' to each side of the equation.
30 + -30 + d = 70 + -30

Combine like terms: 30 + -30 = 0
0 + d = 70 + -30
d = 70 + -30

Combine like terms: 70 + -30 = 40
d = 40

Simplifying
d = 40

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