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Simplifying
7r2 + -14 = -7
Reorder the terms:
-14 + 7r2 = -7
Solving
-14 + 7r2 = -7
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '14' to each side of the equation.
-14 + 14 + 7r2 = -7 + 14
Combine like terms: -14 + 14 = 0
0 + 7r2 = -7 + 14
7r2 = -7 + 14
Combine like terms: -7 + 14 = 7
7r2 = 7
Divide each side by '7'.
r2 = 1
Simplifying
r2 = 1
Take the square root of each side:
r = {-1, 1}
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