1+3r=7+r

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Solution for 1+3r=7+r equation:


Simplifying
1 + 3r = 7 + r

Solving
1 + 3r = 7 + r

Solving for variable 'r'.

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

Add '-1r' to each side of the equation.
1 + 3r + -1r = 7 + r + -1r

Combine like terms: 3r + -1r = 2r
1 + 2r = 7 + r + -1r

Combine like terms: r + -1r = 0
1 + 2r = 7 + 0
1 + 2r = 7

Add '-1' to each side of the equation.
1 + -1 + 2r = 7 + -1

Combine like terms: 1 + -1 = 0
0 + 2r = 7 + -1
2r = 7 + -1

Combine like terms: 7 + -1 = 6
2r = 6

Divide each side by '2'.
r = 3

Simplifying
r = 3

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