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g in (-oo:+oo)
(10-g)/(-2) = 7 // - 7
(10-g)/(-2)-7 = 0
(10-g)/(-2)+(-7*(-2))/(-2) = 0
10-g-7*(-2) = 0
24-g = 0
(24-g)/(-2) = 0
(24-g)/(-2) = 0 // * -2
24-g = 0
24-g = 0 // - 24
-g = -24 // * -1
g = 24
g = 24
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