4(r+3)=2(r+9)

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Solution for 4(r+3)=2(r+9) equation:


Simplifying
4(r + 3) = 2(r + 9)

Reorder the terms:
4(3 + r) = 2(r + 9)
(3 * 4 + r * 4) = 2(r + 9)
(12 + 4r) = 2(r + 9)

Reorder the terms:
12 + 4r = 2(9 + r)
12 + 4r = (9 * 2 + r * 2)
12 + 4r = (18 + 2r)

Solving
12 + 4r = 18 + 2r

Solving for variable 'r'.

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

Add '-2r' to each side of the equation.
12 + 4r + -2r = 18 + 2r + -2r

Combine like terms: 4r + -2r = 2r
12 + 2r = 18 + 2r + -2r

Combine like terms: 2r + -2r = 0
12 + 2r = 18 + 0
12 + 2r = 18

Add '-12' to each side of the equation.
12 + -12 + 2r = 18 + -12

Combine like terms: 12 + -12 = 0
0 + 2r = 18 + -12
2r = 18 + -12

Combine like terms: 18 + -12 = 6
2r = 6

Divide each side by '2'.
r = 3

Simplifying
r = 3

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