-3x=-21+4x

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


Simplifying
-3x = -21 + 4x

Solving
-3x = -21 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
-3x + -4x = -21 + 4x + -4x

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

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

Divide each side by '-7'.
x = 3

Simplifying
x = 3

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