r+645=870

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Solution for r+645=870 equation: 


Simplifying
r + 645 = 870

Reorder the terms:
645 + r = 870

Solving
645 + r = 870

Solving for variable 'r'.

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

Add '-645' to each side of the equation.
645 + -645 + r = 870 + -645

Combine like terms: 645 + -645 = 0
0 + r = 870 + -645
r = 870 + -645

Combine like terms: 870 + -645 = 225
r = 225

Simplifying
r = 225

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