1+3x=21-x

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Solution for 1+3x=21-x equation:


Simplifying
1 + 3x = 21 + -1x

Solving
1 + 3x = 21 + -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.
1 + 3x + x = 21 + -1x + x

Combine like terms: 3x + x = 4x
1 + 4x = 21 + -1x + x

Combine like terms: -1x + x = 0
1 + 4x = 21 + 0
1 + 4x = 21

Add '-1' to each side of the equation.
1 + -1 + 4x = 21 + -1

Combine like terms: 1 + -1 = 0
0 + 4x = 21 + -1
4x = 21 + -1

Combine like terms: 21 + -1 = 20
4x = 20

Divide each side by '4'.
x = 5

Simplifying
x = 5

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