-3+4x-7x=21

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


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

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

Solving
-3 + -3x = 21

Solving for variable 'x'.

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

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

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

Combine like terms: 21 + 3 = 24
-3x = 24

Divide each side by '-3'.
x = -8

Simplifying
x = -8

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