30-9x=-7x+21

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Solution for 30-9x=-7x+21 equation:


Simplifying
30 + -9x = -7x + 21

Reorder the terms:
30 + -9x = 21 + -7x

Solving
30 + -9x = 21 + -7x

Solving for variable 'x'.

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

Add '7x' to each side of the equation.
30 + -9x + 7x = 21 + -7x + 7x

Combine like terms: -9x + 7x = -2x
30 + -2x = 21 + -7x + 7x

Combine like terms: -7x + 7x = 0
30 + -2x = 21 + 0
30 + -2x = 21

Add '-30' to each side of the equation.
30 + -30 + -2x = 21 + -30

Combine like terms: 30 + -30 = 0
0 + -2x = 21 + -30
-2x = 21 + -30

Combine like terms: 21 + -30 = -9
-2x = -9

Divide each side by '-2'.
x = 4.5

Simplifying
x = 4.5

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