r^2-9r=r^2-10r+25

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Solution for r^2-9r=r^2-10r+25 equation:


Simplifying
r2 + -9r = r2 + -10r + 25

Reorder the terms:
-9r + r2 = r2 + -10r + 25

Reorder the terms:
-9r + r2 = 25 + -10r + r2

Add '-1r2' to each side of the equation.
-9r + r2 + -1r2 = 25 + -10r + r2 + -1r2

Combine like terms: r2 + -1r2 = 0
-9r + 0 = 25 + -10r + r2 + -1r2
-9r = 25 + -10r + r2 + -1r2

Combine like terms: r2 + -1r2 = 0
-9r = 25 + -10r + 0
-9r = 25 + -10r

Solving
-9r = 25 + -10r

Solving for variable 'r'.

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

Add '10r' to each side of the equation.
-9r + 10r = 25 + -10r + 10r

Combine like terms: -9r + 10r = 1r
1r = 25 + -10r + 10r

Combine like terms: -10r + 10r = 0
1r = 25 + 0
1r = 25

Divide each side by '1'.
r = 25

Simplifying
r = 25

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