20=r+6+7

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Solution for 20=r+6+7 equation: 


Simplifying
20 = r + 6 + 7

Reorder the terms:
20 = 6 + 7 + r

Combine like terms: 6 + 7 = 13
20 = 13 + r

Solving
20 = 13 + r

Solving for variable 'r'.

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

Add '-1r' to each side of the equation.
20 + -1r = 13 + r + -1r

Combine like terms: r + -1r = 0
20 + -1r = 13 + 0
20 + -1r = 13

Add '-20' to each side of the equation.
20 + -20 + -1r = 13 + -20

Combine like terms: 20 + -20 = 0
0 + -1r = 13 + -20
-1r = 13 + -20

Combine like terms: 13 + -20 = -7
-1r = -7

Divide each side by '-1'.
r = 7

Simplifying
r = 7

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