40=16-4(9-3r)

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Solution for 40=16-4(9-3r) equation:


Simplifying
40 = 16 + -4(9 + -3r)
40 = 16 + (9 * -4 + -3r * -4)
40 = 16 + (-36 + 12r)

Combine like terms: 16 + -36 = -20
40 = -20 + 12r

Solving
40 = -20 + 12r

Solving for variable 'r'.

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

Add '-12r' to each side of the equation.
40 + -12r = -20 + 12r + -12r

Combine like terms: 12r + -12r = 0
40 + -12r = -20 + 0
40 + -12r = -20

Add '-40' to each side of the equation.
40 + -40 + -12r = -20 + -40

Combine like terms: 40 + -40 = 0
0 + -12r = -20 + -40
-12r = -20 + -40

Combine like terms: -20 + -40 = -60
-12r = -60

Divide each side by '-12'.
r = 5

Simplifying
r = 5

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