r-7=0

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Solution for r-7=0 equation: 


Simplifying
r + -7 = 0

Reorder the terms:
-7 + r = 0

Solving
-7 + r = 0

Solving for variable 'r'.

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

Add '7' to each side of the equation.
-7 + 7 + r = 0 + 7

Combine like terms: -7 + 7 = 0
0 + r = 0 + 7
r = 0 + 7

Combine like terms: 0 + 7 = 7
r = 7

Simplifying
r = 7

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