90=2x+7+21

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Solution for 90=2x+7+21 equation: 


Simplifying
90 = 2x + 7 + 21

Reorder the terms:
90 = 7 + 21 + 2x

Combine like terms: 7 + 21 = 28
90 = 28 + 2x

Solving
90 = 28 + 2x

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
90 + -2x = 28 + 2x + -2x

Combine like terms: 2x + -2x = 0
90 + -2x = 28 + 0
90 + -2x = 28

Add '-90' to each side of the equation.
90 + -90 + -2x = 28 + -90

Combine like terms: 90 + -90 = 0
0 + -2x = 28 + -90
-2x = 28 + -90

Combine like terms: 28 + -90 = -62
-2x = -62

Divide each side by '-2'.
x = 31

Simplifying
x = 31

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