10-(-4r)=30

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Solution for 10-(-4r)=30 equation: 


Simplifying
10 + -1(-4r) = 30

Remove parenthesis around (-4r)
10 + -1 * -4r = 30

Multiply -1 * -4
10 + 4r = 30

Solving
10 + 4r = 30

Solving for variable 'r'.

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

Add '-10' to each side of the equation.
10 + -10 + 4r = 30 + -10

Combine like terms: 10 + -10 = 0
0 + 4r = 30 + -10
4r = 30 + -10

Combine like terms: 30 + -10 = 20
4r = 20

Divide each side by '4'.
r = 5

Simplifying
r = 5

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