a*d+c=90

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Solution for a*d+c=90 equation: 


Simplifying
a * d + c = 90

Multiply a * d
ad + c = 90

Solving
ad + c = 90

Solving for variable 'a'.

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

Add '-1c' to each side of the equation.
ad + c + -1c = 90 + -1c

Combine like terms: c + -1c = 0
ad + 0 = 90 + -1c
ad = 90 + -1c

Divide each side by 'd'.
a = 90d-1 + -1cd-1

Simplifying
a = 90d-1 + -1cd-1

Reorder the terms:
a = -1cd-1 + 90d-1

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