-13=-4r+50+1/2r

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Solution for -13=-4r+50+1/2r equation: 


r in (-oo:+oo)

-13 = (1/2)*r-4*r+50 // - (1/2)*r-4*r+50

-(-4*r)-((1/2)*r)-50-13 = 0

4*r+(-1/2)*r-50-13 = 0

7/2*r-63 = 0 // + 63

7/2*r = 63 // : 7/2

r = 63/7/2

r = 18

r = 18

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