-21=3x+x+7

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Solution for -21=3x+x+7 equation:


Simplifying
-21 = 3x + x + 7

Reorder the terms:
-21 = 7 + 3x + x

Combine like terms: 3x + x = 4x
-21 = 7 + 4x

Solving
-21 = 7 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
-21 + -4x = 7 + 4x + -4x

Combine like terms: 4x + -4x = 0
-21 + -4x = 7 + 0
-21 + -4x = 7

Add '21' to each side of the equation.
-21 + 21 + -4x = 7 + 21

Combine like terms: -21 + 21 = 0
0 + -4x = 7 + 21
-4x = 7 + 21

Combine like terms: 7 + 21 = 28
-4x = 28

Divide each side by '-4'.
x = -7

Simplifying
x = -7

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