3x-7x+21=-13

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Solution for 3x-7x+21=-13 equation:


Simplifying
3x + -7x + 21 = -13

Reorder the terms:
21 + 3x + -7x = -13

Combine like terms: 3x + -7x = -4x
21 + -4x = -13

Solving
21 + -4x = -13

Solving for variable 'x'.

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

Add '-21' to each side of the equation.
21 + -21 + -4x = -13 + -21

Combine like terms: 21 + -21 = 0
0 + -4x = -13 + -21
-4x = -13 + -21

Combine like terms: -13 + -21 = -34
-4x = -34

Divide each side by '-4'.
x = 8.5

Simplifying
x = 8.5

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