-21=-3x-x-7

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


Simplifying
-21 = -3x + -1x + -7

Reorder the terms:
-21 = -7 + -3x + -1x

Combine like terms: -3x + -1x = -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 = 14
4x = 14

Divide each side by '4'.
x = 3.5

Simplifying
x = 3.5

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