3r+4.5=12

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Solution for 3r+4.5=12 equation: 


Simplifying
3r + 4.5 = 12

Reorder the terms:
4.5 + 3r = 12

Solving
4.5 + 3r = 12

Solving for variable 'r'.

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

Add '-4.5' to each side of the equation.
4.5 + -4.5 + 3r = 12 + -4.5

Combine like terms: 4.5 + -4.5 = 0.0
0.0 + 3r = 12 + -4.5
3r = 12 + -4.5

Combine like terms: 12 + -4.5 = 7.5
3r = 7.5

Divide each side by '3'.
r = 2.5

Simplifying
r = 2.5

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