21+5x+7x+3=18

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Solution for 21+5x+7x+3=18 equation:


Simplifying
21 + 5x + 7x + 3 = 18

Reorder the terms:
21 + 3 + 5x + 7x = 18

Combine like terms: 21 + 3 = 24
24 + 5x + 7x = 18

Combine like terms: 5x + 7x = 12x
24 + 12x = 18

Solving
24 + 12x = 18

Solving for variable 'x'.

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

Add '-24' to each side of the equation.
24 + -24 + 12x = 18 + -24

Combine like terms: 24 + -24 = 0
0 + 12x = 18 + -24
12x = 18 + -24

Combine like terms: 18 + -24 = -6
12x = -6

Divide each side by '12'.
x = -0.5

Simplifying
x = -0.5

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