3x+15=20-x

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


Simplifying
3x + 15 = 20 + -1x

Reorder the terms:
15 + 3x = 20 + -1x

Solving
15 + 3x = 20 + -1x

Solving for variable 'x'.

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

Add 'x' to each side of the equation.
15 + 3x + x = 20 + -1x + x

Combine like terms: 3x + x = 4x
15 + 4x = 20 + -1x + x

Combine like terms: -1x + x = 0
15 + 4x = 20 + 0
15 + 4x = 20

Add '-15' to each side of the equation.
15 + -15 + 4x = 20 + -15

Combine like terms: 15 + -15 = 0
0 + 4x = 20 + -15
4x = 20 + -15

Combine like terms: 20 + -15 = 5
4x = 5

Divide each side by '4'.
x = 1.25

Simplifying
x = 1.25

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