-3+5x-7x=-21

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Solution for -3+5x-7x=-21 equation: 


Simplifying
-3 + 5x + -7x = -21

Combine like terms: 5x + -7x = -2x
-3 + -2x = -21

Solving
-3 + -2x = -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 + -2x = -21 + 3

Combine like terms: -3 + 3 = 0
0 + -2x = -21 + 3
-2x = -21 + 3

Combine like terms: -21 + 3 = -18
-2x = -18

Divide each side by '-2'.
x = 9

Simplifying
x = 9

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