4x+(9-x)=30

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Solution for 4x+(9-x)=30 equation:


Simplifying
4x + (9 + -1x) = 30

Remove parenthesis around (9 + -1x)
4x + 9 + -1x = 30

Reorder the terms:
9 + 4x + -1x = 30

Combine like terms: 4x + -1x = 3x
9 + 3x = 30

Solving
9 + 3x = 30

Solving for variable 'x'.

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

Add '-9' to each side of the equation.
9 + -9 + 3x = 30 + -9

Combine like terms: 9 + -9 = 0
0 + 3x = 30 + -9
3x = 30 + -9

Combine like terms: 30 + -9 = 21
3x = 21

Divide each side by '3'.
x = 7

Simplifying
x = 7

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