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(1/4)*x+(7/16)*x = 1/2-13 // - 1/2-13
(1/4)*x+(7/16)*x-(1/2)+13 = 0
(1/4)*x+(7/16)*x-1/2+13 = 0
11/16*x+25/2 = 0 // - 25/2
11/16*x = -25/2 // : 11/16
x = -25/2/11/16
x = -200/11
x = -200/11
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