18=4-r

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Solution for 18=4-r equation:


Simplifying
18 = 4 + -1r

Solving
18 = 4 + -1r

Solving for variable 'r'.

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

Add 'r' to each side of the equation.
18 + r = 4 + -1r + r

Combine like terms: -1r + r = 0
18 + r = 4 + 0
18 + r = 4

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

Combine like terms: 18 + -18 = 0
0 + r = 4 + -18
r = 4 + -18

Combine like terms: 4 + -18 = -14
r = -14

Simplifying
r = -14

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