75+(45-2r)=90

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Solution for 75+(45-2r)=90 equation:


Simplifying
75 + (45 + -2r) = 90

Remove parenthesis around (45 + -2r)
75 + 45 + -2r = 90

Combine like terms: 75 + 45 = 120
120 + -2r = 90

Solving
120 + -2r = 90

Solving for variable 'r'.

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

Add '-120' to each side of the equation.
120 + -120 + -2r = 90 + -120

Combine like terms: 120 + -120 = 0
0 + -2r = 90 + -120
-2r = 90 + -120

Combine like terms: 90 + -120 = -30
-2r = -30

Divide each side by '-2'.
r = 15

Simplifying
r = 15

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