-10+5(2r-10)=90

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Solution for -10+5(2r-10)=90 equation:


Simplifying
-10 + 5(2r + -10) = 90

Reorder the terms:
-10 + 5(-10 + 2r) = 90
-10 + (-10 * 5 + 2r * 5) = 90
-10 + (-50 + 10r) = 90

Combine like terms: -10 + -50 = -60
-60 + 10r = 90

Solving
-60 + 10r = 90

Solving for variable 'r'.

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

Add '60' to each side of the equation.
-60 + 60 + 10r = 90 + 60

Combine like terms: -60 + 60 = 0
0 + 10r = 90 + 60
10r = 90 + 60

Combine like terms: 90 + 60 = 150
10r = 150

Divide each side by '10'.
r = 15

Simplifying
r = 15

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