r-0.5=4

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Solution for r-0.5=4 equation: 


Simplifying
r + -0.5 = 4

Reorder the terms:
-0.5 + r = 4

Solving
-0.5 + r = 4

Solving for variable 'r'.

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

Add '0.5' to each side of the equation.
-0.5 + 0.5 + r = 4 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + r = 4 + 0.5
r = 4 + 0.5

Combine like terms: 4 + 0.5 = 4.5
r = 4.5

Simplifying
r = 4.5

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