3(x+5)+x=6x-21

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Solution for 3(x+5)+x=6x-21 equation: 


Simplifying
3(x + 5) + x = 6x + -21

Reorder the terms:
3(5 + x) + x = 6x + -21
(5 * 3 + x * 3) + x = 6x + -21
(15 + 3x) + x = 6x + -21

Combine like terms: 3x + x = 4x
15 + 4x = 6x + -21

Reorder the terms:
15 + 4x = -21 + 6x

Solving
15 + 4x = -21 + 6x

Solving for variable 'x'.

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

Add '-6x' to each side of the equation.
15 + 4x + -6x = -21 + 6x + -6x

Combine like terms: 4x + -6x = -2x
15 + -2x = -21 + 6x + -6x

Combine like terms: 6x + -6x = 0
15 + -2x = -21 + 0
15 + -2x = -21

Add '-15' to each side of the equation.
15 + -15 + -2x = -21 + -15

Combine like terms: 15 + -15 = 0
0 + -2x = -21 + -15
-2x = -21 + -15

Combine like terms: -21 + -15 = -36
-2x = -36

Divide each side by '-2'.
x = 18

Simplifying
x = 18

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