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

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


Simplifying
21 + -1(x + 3) = (x + 4)

Reorder the terms:
21 + -1(3 + x) = (x + 4)
21 + (3 * -1 + x * -1) = (x + 4)
21 + (-3 + -1x) = (x + 4)

Combine like terms: 21 + -3 = 18
18 + -1x = (x + 4)

Reorder the terms:
18 + -1x = (4 + x)

Remove parenthesis around (4 + x)
18 + -1x = 4 + x

Solving
18 + -1x = 4 + x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
18 + -1x + -1x = 4 + x + -1x

Combine like terms: -1x + -1x = -2x
18 + -2x = 4 + x + -1x

Combine like terms: x + -1x = 0
18 + -2x = 4 + 0
18 + -2x = 4

Add '-18' to each side of the equation.
18 + -18 + -2x = 4 + -18

Combine like terms: 18 + -18 = 0
0 + -2x = 4 + -18
-2x = 4 + -18

Combine like terms: 4 + -18 = -14
-2x = -14

Divide each side by '-2'.
x = 7

Simplifying
x = 7

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