x+20+3x=-15-3x-21

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Solution for x+20+3x=-15-3x-21 equation: 


Simplifying
x + 20 + 3x = -15 + -3x + -21

Reorder the terms:
20 + x + 3x = -15 + -3x + -21

Combine like terms: x + 3x = 4x
20 + 4x = -15 + -3x + -21

Reorder the terms:
20 + 4x = -15 + -21 + -3x

Combine like terms: -15 + -21 = -36
20 + 4x = -36 + -3x

Solving
20 + 4x = -36 + -3x

Solving for variable 'x'.

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

Add '3x' to each side of the equation.
20 + 4x + 3x = -36 + -3x + 3x

Combine like terms: 4x + 3x = 7x
20 + 7x = -36 + -3x + 3x

Combine like terms: -3x + 3x = 0
20 + 7x = -36 + 0
20 + 7x = -36

Add '-20' to each side of the equation.
20 + -20 + 7x = -36 + -20

Combine like terms: 20 + -20 = 0
0 + 7x = -36 + -20
7x = -36 + -20

Combine like terms: -36 + -20 = -56
7x = -56

Divide each side by '7'.
x = -8

Simplifying
x = -8

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