9=-3[4+r]

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Solution for 9=-3[4+r] equation:


Simplifying
9 = -3[4 + r]
9 = [4 * -3 + r * -3]
9 = [-12 + -3r]

Solving
9 = -12 + -3r

Solving for variable 'r'.

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

Add '3r' to each side of the equation.
9 + 3r = -12 + -3r + 3r

Combine like terms: -3r + 3r = 0
9 + 3r = -12 + 0
9 + 3r = -12

Add '-9' to each side of the equation.
9 + -9 + 3r = -12 + -9

Combine like terms: 9 + -9 = 0
0 + 3r = -12 + -9
3r = -12 + -9

Combine like terms: -12 + -9 = -21
3r = -21

Divide each side by '3'.
r = -7

Simplifying
r = -7

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