1/4r-(-1/2r)=-9

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Solution for 1/4r-(-1/2r)=-9 equation: 


r in (-oo:+oo)

(1/4)*r-((-1/2)*r) = -9 // + 9

(1/4)*r-((-1/2)*r)+9 = 0

(1/4)*r+(1/2)*r+9 = 0

3/4*r+9 = 0 // - 9

3/4*r = -9 // : 3/4

r = -9/3/4

r = -12

r = -12

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