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Simplifying
(5 + -1r2) = 3.75
Remove parenthesis around (5 + -1r2)
5 + -1r2 = 3.75
Solving
5 + -1r2 = 3.75
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '-5' to each side of the equation.
5 + -5 + -1r2 = 3.75 + -5
Combine like terms: 5 + -5 = 0
0 + -1r2 = 3.75 + -5
-1r2 = 3.75 + -5
Combine like terms: 3.75 + -5 = -1.25
-1r2 = -1.25
Divide each side by '-1'.
r2 = 1.25
Simplifying
r2 = 1.25
Take the square root of each side:
r = {-1.118033989, 1.118033989}
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