r(1)=1(90-3(1))

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Solution for r(1)=1(90-3(1)) equation: 


Simplifying
r(1) = 1(90 + -3(1))

Reorder the terms for easier multiplication:
1r = 1(90 + -3(1))

Multiply -3 * 1
1r = 1(90 + -3)

Combine like terms: 90 + -3 = 87
1r = 1(87)

Multiply 1 * 87
1r = 87

Solving
1r = 87

Solving for variable 'r'.

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

Divide each side by '1'.
r = 87

Simplifying
r = 87

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