30-42=55-d

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Solution for 30-42=55-d equation:


Simplifying
30 + -42 = 55 + -1d

Combine like terms: 30 + -42 = -12
-12 = 55 + -1d

Solving
-12 = 55 + -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.
-12 + d = 55 + -1d + d

Combine like terms: -1d + d = 0
-12 + d = 55 + 0
-12 + d = 55

Add '12' to each side of the equation.
-12 + 12 + d = 55 + 12

Combine like terms: -12 + 12 = 0
0 + d = 55 + 12
d = 55 + 12

Combine like terms: 55 + 12 = 67
d = 67

Simplifying
d = 67

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