x+5-7+8=21

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Solution for x+5-7+8=21 equation:


Simplifying
x + 5 + -7 + 8 = 21

Reorder the terms:
5 + -7 + 8 + x = 21

Combine like terms: 5 + -7 = -2
-2 + 8 + x = 21

Combine like terms: -2 + 8 = 6
6 + x = 21

Solving
6 + x = 21

Solving for variable 'x'.

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

Add '-6' to each side of the equation.
6 + -6 + x = 21 + -6

Combine like terms: 6 + -6 = 0
0 + x = 21 + -6
x = 21 + -6

Combine like terms: 21 + -6 = 15
x = 15

Simplifying
x = 15

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