2(r-7.50)/3=40

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Solution for 2(r-7.50)/3=40 equation: 


r in (-oo:+oo)

(2*(r-7.5))/3 = 40 // - 40

(2*(r-7.5))/3-40 = 0

(2*(r-7.5))/3+(-40*3)/3 = 0

2*(r-7.5)-40*3 = 0

2*r-135 = 0

(2*r-135)/3 = 0

(2*r-135)/3 = 0 // * 3

2*r-135 = 0

2*r-135 = 0 // + 135

2*r = 135 // : 2

r = 135/2

r = 135/2

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