-21=7x-4x-3

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Solution for -21=7x-4x-3 equation:


Simplifying
-21 = 7x + -4x + -3

Reorder the terms:
-21 = -3 + 7x + -4x

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

Solving
-21 = -3 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
-21 + -3x = -3 + 3x + -3x

Combine like terms: 3x + -3x = 0
-21 + -3x = -3 + 0
-21 + -3x = -3

Add '21' to each side of the equation.
-21 + 21 + -3x = -3 + 21

Combine like terms: -21 + 21 = 0
0 + -3x = -3 + 21
-3x = -3 + 21

Combine like terms: -3 + 21 = 18
-3x = 18

Divide each side by '-3'.
x = -6

Simplifying
x = -6

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