6x-1+x=90

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Solution for 6x-1+x=90 equation: 


Simplifying
6x + -1 + x = 90

Reorder the terms:
-1 + 6x + x = 90

Combine like terms: 6x + x = 7x
-1 + 7x = 90

Solving
-1 + 7x = 90

Solving for variable 'x'.

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

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

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

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

Divide each side by '7'.
x = 13

Simplifying
x = 13

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