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Simplifying
25r2 + 7 = 107
Reorder the terms:
7 + 25r2 = 107
Solving
7 + 25r2 = 107
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 + 25r2 = 107 + -7
Combine like terms: 7 + -7 = 0
0 + 25r2 = 107 + -7
25r2 = 107 + -7
Combine like terms: 107 + -7 = 100
25r2 = 100
Divide each side by '25'.
r2 = 4
Simplifying
r2 = 4
Take the square root of each side:
r = {-2, 2}
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