7-7x+3x=-21

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


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

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

Solving
7 + -4x = -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 + -4x = -21 + -7

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

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

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

Simplifying
x = 7

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