r+r+6=378

Solution for r+r+6=378 equation:

Simplifying
r + r + 6 = 378

Reorder the terms:
6 + r + r = 378

Combine like terms: r + r = 2r
6 + 2r = 378

Solving
6 + 2r = 378

Solving for variable 'r'.

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

Add '-6' to each side of the equation.
6 + -6 + 2r = 378 + -6

Combine like terms: 6 + -6 = 0
0 + 2r = 378 + -6
2r = 378 + -6

Combine like terms: 378 + -6 = 372
2r = 372

Divide each side by '2'.
r = 186

Simplifying
r = 186