3x+20+10x-21=90

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Solution for 3x+20+10x-21=90 equation:


Simplifying
3x + 20 + 10x + -21 = 90

Reorder the terms:
20 + -21 + 3x + 10x = 90

Combine like terms: 20 + -21 = -1
-1 + 3x + 10x = 90

Combine like terms: 3x + 10x = 13x
-1 + 13x = 90

Solving
-1 + 13x = 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 + 13x = 90 + 1

Combine like terms: -1 + 1 = 0
0 + 13x = 90 + 1
13x = 90 + 1

Combine like terms: 90 + 1 = 91
13x = 91

Divide each side by '13'.
x = 7

Simplifying
x = 7

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