1-[r+2]=9

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Solution for 1-[r+2]=9 equation:


Simplifying
1 + -1[r + 2] = 9

Reorder the terms:
1 + -1[2 + r] = 9
1 + [2 * -1 + r * -1] = 9
1 + [-2 + -1r] = 9

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

Solving
-1 + -1r = 9

Solving for variable 'r'.

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

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

Combine like terms: -1 + 1 = 0
0 + -1r = 9 + 1
-1r = 9 + 1

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

Divide each side by '-1'.
r = -10

Simplifying
r = -10

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