3x=-4x+21

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


Simplifying
3x = -4x + 21

Reorder the terms:
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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