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1.4*x-(1/1.4) = 2.8 // - 2.8
1.4*x-(1/1.4)-2.8 = 0
1.4*x-2.8-0.71428571 = 0
1.4*x-3.51428571 = 0 // + 3.51428571
1.4*x = 3.51428571 // : 1.4
x = 3.51428571/1.4
x = 2.51020408
x = 2.51020408
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