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(3.5*x+2.8)/7 = 0.5*x+0.4 // - 0.5*x+0.4
(3.5*x+2.8)/7-(0.5*x)-0.4 = 0
(3.5*x+2.8)/7-0.5*x-0.4 = 0
(3.5*x+2.8)/7+(-0.5*7*x)/7+(-0.4*7)/7 = 0
3.5*x-0.5*7*x-0.4*7+2.8 = 0
2.8-2.8 = 0
0 = 0
0/7 = 0
0/7 = 0 // * 7
0 = 0
x belongs to the empty set
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