7a-1=90

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Solution for 7a-1=90 equation: 


Simplifying
7a + -1 = 90

Reorder the terms:
-1 + 7a = 90

Solving
-1 + 7a = 90

Solving for variable 'a'.

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

Add '1' to each side of the equation.
-1 + 1 + 7a = 90 + 1

Combine like terms: -1 + 1 = 0
0 + 7a = 90 + 1
7a = 90 + 1

Combine like terms: 90 + 1 = 91
7a = 91

Divide each side by '7'.
a = 13

Simplifying
a = 13

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