-4+2(r-10)=9-(r-9)

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Solution for -4+2(r-10)=9-(r-9) equation:


Simplifying
-4 + 2(r + -10) = 9 + -1(r + -9)

Reorder the terms:
-4 + 2(-10 + r) = 9 + -1(r + -9)
-4 + (-10 * 2 + r * 2) = 9 + -1(r + -9)
-4 + (-20 + 2r) = 9 + -1(r + -9)

Combine like terms: -4 + -20 = -24
-24 + 2r = 9 + -1(r + -9)

Reorder the terms:
-24 + 2r = 9 + -1(-9 + r)
-24 + 2r = 9 + (-9 * -1 + r * -1)
-24 + 2r = 9 + (9 + -1r)

Combine like terms: 9 + 9 = 18
-24 + 2r = 18 + -1r

Solving
-24 + 2r = 18 + -1r

Solving for variable 'r'.

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

Add 'r' to each side of the equation.
-24 + 2r + r = 18 + -1r + r

Combine like terms: 2r + r = 3r
-24 + 3r = 18 + -1r + r

Combine like terms: -1r + r = 0
-24 + 3r = 18 + 0
-24 + 3r = 18

Add '24' to each side of the equation.
-24 + 24 + 3r = 18 + 24

Combine like terms: -24 + 24 = 0
0 + 3r = 18 + 24
3r = 18 + 24

Combine like terms: 18 + 24 = 42
3r = 42

Divide each side by '3'.
r = 14

Simplifying
r = 14

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