What is the first step when adding or subtracting rational expressions with unlike denominators?

f

step-by-step explanation:

f

83-45=38

38 was the other number

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-thekoolkid1o1

can someone me: the midsegment through the legs of an isosceles triangle is 4 in. find the sides of the triangle if its perimeter is 20 in. ,   and point g is the centroid of the right △abc with hypotenuse ab=18 in. find cg.