(3x+9)-(x+4)=

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Solution for (3x+9)-(x+4)= equation:


Simplifying
(3x + 9) + -1(x + 4) = 0

Reorder the terms:
(9 + 3x) + -1(x + 4) = 0

Remove parenthesis around (9 + 3x)
9 + 3x + -1(x + 4) = 0

Reorder the terms:
9 + 3x + -1(4 + x) = 0
9 + 3x + (4 * -1 + x * -1) = 0
9 + 3x + (-4 + -1x) = 0

Reorder the terms:
9 + -4 + 3x + -1x = 0

Combine like terms: 9 + -4 = 5
5 + 3x + -1x = 0

Combine like terms: 3x + -1x = 2x
5 + 2x = 0

Solving
5 + 2x = 0

Solving for variable 'x'.

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

Add '-5' to each side of the equation.
5 + -5 + 2x = 0 + -5

Combine like terms: 5 + -5 = 0
0 + 2x = 0 + -5
2x = 0 + -5

Combine like terms: 0 + -5 = -5
2x = -5

Divide each side by '2'.
x = -2.5

Simplifying
x = -2.5

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