Question

How do I solve r/10+4=5

Answer 1

r = 10

Explanation:

I'm assuming the "+4" is not in the denominator. If that assumption is true, then here is what the steps look like

(r/10) + 4 = 5

r/10 = 5-4 ... see note 1 below

r/10 = 1

r = 10*1 ... see note 2

r = 10

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note 1: I subtracted 4 from both sides to undo the "+4"

note 2: I multiplied both sides by 10 to undo the operation of division by 10.

The steps shown above basically follow PEMDAS in reverse to undo the operations that are happening to the variable. So we start with undoing subtraction, then we undo addition, and so forth until the variable is isolated.