r=0.70(220-a)

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Solution for r=0.70(220-a) equation: 


Simplifying
r = 0.70(220 + -1a)
r = (220 * 0.70 + -1a * 0.70)
r = (154 + -0.7a)

Solving
r = 154 + -0.7a

Solving for variable 'r'.

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

Simplifying
r = 154 + -0.7a

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