1x+3x+s=21

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


Simplifying
1x + 3x + s = 21

Reorder the terms:
s + 1x + 3x = 21

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

Solving
s + 4x = 21

Solving for variable 's'.

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

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

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

Simplifying
s = 21 + -4x

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