-7+3x=21-x

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


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

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

Solving for variable 'x'.

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

Add 'x' to each side of the equation.
-7 + 3x + x = 21 + -1x + x

Combine like terms: 3x + x = 4x
-7 + 4x = 21 + -1x + x

Combine like terms: -1x + x = 0
-7 + 4x = 21 + 0
-7 + 4x = 21

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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