4-(-3r)=13

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Solution for 4-(-3r)=13 equation: 


Simplifying
4 + -1(-3r) = 13

Remove parenthesis around (-3r)
4 + -1 * -3r = 13

Multiply -1 * -3
4 + 3r = 13

Solving
4 + 3r = 13

Solving for variable 'r'.

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

Add '-4' to each side of the equation.
4 + -4 + 3r = 13 + -4

Combine like terms: 4 + -4 = 0
0 + 3r = 13 + -4
3r = 13 + -4

Combine like terms: 13 + -4 = 9
3r = 9

Divide each side by '3'.
r = 3

Simplifying
r = 3

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