7x+21=90

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Solution for 7x+21=90 equation: 


Simplifying
7x + 21 = 90

Reorder the terms:
21 + 7x = 90

Solving
21 + 7x = 90

Solving for variable 'x'.

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

Add '-21' to each side of the equation.
21 + -21 + 7x = 90 + -21

Combine like terms: 21 + -21 = 0
0 + 7x = 90 + -21
7x = 90 + -21

Combine like terms: 90 + -21 = 69
7x = 69

Divide each side by '7'.
x = 9.857142857

Simplifying
x = 9.857142857

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