45+75+3r=180

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Solution for 45+75+3r=180 equation: 


Simplifying
45 + 75 + 3r = 180

Combine like terms: 45 + 75 = 120
120 + 3r = 180

Solving
120 + 3r = 180

Solving for variable 'r'.

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

Add '-120' to each side of the equation.
120 + -120 + 3r = 180 + -120

Combine like terms: 120 + -120 = 0
0 + 3r = 180 + -120
3r = 180 + -120

Combine like terms: 180 + -120 = 60
3r = 60

Divide each side by '3'.
r = 20

Simplifying
r = 20

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