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g in (-oo:+oo)
(7*(5*g+2))/4 = 21 // - 21
(7*(5*g+2))/4-21 = 0
(7*(5*g+2))/4+(-21*4)/4 = 0
7*(5*g+2)-21*4 = 0
35*g-70 = 0
(35*g-70)/4 = 0
(35*g-70)/4 = 0 // * 4
35*g-70 = 0
35*g-70 = 0 // + 70
35*g = 70 // : 35
g = 70/35
g = 2
g = 2
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