20x+10x+r=40

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Solution for 20x+10x+r=40 equation: 


Simplifying
20x + 10x + r = 40

Reorder the terms:
r + 20x + 10x = 40

Combine like terms: 20x + 10x = 30x
r + 30x = 40

Solving
r + 30x = 40

Solving for variable 'r'.

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

Add '-30x' to each side of the equation.
r + 30x + -30x = 40 + -30x

Combine like terms: 30x + -30x = 0
r + 0 = 40 + -30x
r = 40 + -30x

Simplifying
r = 40 + -30x

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