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a in (-oo:+oo)
2*((7/16)*a+5) = (7/8)*a-10 // - (7/8)*a-10
2*((7/16)*a+5)-((7/8)*a)+10 = 0
2*((7/16)*a+5)+(-7/8)*a+10 = 0
2*(7/16*a+5)+(-7*a)/8+10 = 0
(2*8*(7/16*a+5))/8+(-7*a)/8+(8*10)/8 = 0
2*8*(7/16*a+5)-7*a+8*10 = 0
80+80 = 0
160 = 0
160/8 = 0
160/8 = 0 // * 8
160 = 0
a belongs to the empty set
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