R+(R-12)=90

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Solution for R+(R-12)=90 equation:


Simplifying
R + (R + -12) = 90

Reorder the terms:
R + (-12 + R) = 90

Remove parenthesis around (-12 + R)
R + -12 + R = 90

Reorder the terms:
-12 + R + R = 90

Combine like terms: R + R = 2R
-12 + 2R = 90

Solving
-12 + 2R = 90

Solving for variable 'R'.

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

Add '12' to each side of the equation.
-12 + 12 + 2R = 90 + 12

Combine like terms: -12 + 12 = 0
0 + 2R = 90 + 12
2R = 90 + 12

Combine like terms: 90 + 12 = 102
2R = 102

Divide each side by '2'.
R = 51

Simplifying
R = 51

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