(r+1)+(r-8)=45

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Solution for (r+1)+(r-8)=45 equation:


Simplifying
(r + 1) + (r + -8) = 45

Reorder the terms:
(1 + r) + (r + -8) = 45

Remove parenthesis around (1 + r)
1 + r + (r + -8) = 45

Reorder the terms:
1 + r + (-8 + r) = 45

Remove parenthesis around (-8 + r)
1 + r + -8 + r = 45

Reorder the terms:
1 + -8 + r + r = 45

Combine like terms: 1 + -8 = -7
-7 + r + r = 45

Combine like terms: r + r = 2r
-7 + 2r = 45

Solving
-7 + 2r = 45

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 + 2r = 45 + 7

Combine like terms: -7 + 7 = 0
0 + 2r = 45 + 7
2r = 45 + 7

Combine like terms: 45 + 7 = 52
2r = 52

Divide each side by '2'.
r = 26

Simplifying
r = 26

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