3r+4+5r=20

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Solution for 3r+4+5r=20 equation: 


Simplifying
3r + 4 + 5r = 20

Reorder the terms:
4 + 3r + 5r = 20

Combine like terms: 3r + 5r = 8r
4 + 8r = 20

Solving
4 + 8r = 20

Solving for variable 'r'.

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

Add '-4' to each side of the equation.
4 + -4 + 8r = 20 + -4

Combine like terms: 4 + -4 = 0
0 + 8r = 20 + -4
8r = 20 + -4

Combine like terms: 20 + -4 = 16
8r = 16

Divide each side by '8'.
r = 2

Simplifying
r = 2

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