18=7+3(r-4)

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Solution for 18=7+3(r-4) equation:


Simplifying
18 = 7 + 3(r + -4)

Reorder the terms:
18 = 7 + 3(-4 + r)
18 = 7 + (-4 * 3 + r * 3)
18 = 7 + (-12 + 3r)

Combine like terms: 7 + -12 = -5
18 = -5 + 3r

Solving
18 = -5 + 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.
18 + -3r = -5 + 3r + -3r

Combine like terms: 3r + -3r = 0
18 + -3r = -5 + 0
18 + -3r = -5

Add '-18' to each side of the equation.
18 + -18 + -3r = -5 + -18

Combine like terms: 18 + -18 = 0
0 + -3r = -5 + -18
-3r = -5 + -18

Combine like terms: -5 + -18 = -23
-3r = -23

Divide each side by '-3'.
r = 7.666666667

Simplifying
r = 7.666666667

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