3r+30-r=4

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Solution for 3r+30-r=4 equation:


Simplifying
3r + 30 + -1r = 4

Reorder the terms:
30 + 3r + -1r = 4

Combine like terms: 3r + -1r = 2r
30 + 2r = 4

Solving
30 + 2r = 4

Solving for variable 'r'.

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

Add '-30' to each side of the equation.
30 + -30 + 2r = 4 + -30

Combine like terms: 30 + -30 = 0
0 + 2r = 4 + -30
2r = 4 + -30

Combine like terms: 4 + -30 = -26
2r = -26

Divide each side by '2'.
r = -13

Simplifying
r = -13

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