-3x-7=-21

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


Simplifying
-3x + -7 = -21

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

Solving
-7 + -3x = -21

Solving for variable 'x'.

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

Add '7' to each side of the equation.
-7 + 7 + -3x = -21 + 7

Combine like terms: -7 + 7 = 0
0 + -3x = -21 + 7
-3x = -21 + 7

Combine like terms: -21 + 7 = -14
-3x = -14

Divide each side by '-3'.
x = 4.666666667

Simplifying
x = 4.666666667

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