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(2+10.2)*(6-x) = 50/5 // - 50/5
(2+10.2)*(6-x)-(50/5) = 0
(2+10.2)*(6-x)-10 = 0
12.2*(6-x)-10 = 0
12.2*(6-x)-10 = 0
63.2-12.2*x = 0
63.2-12.2*x = 0
63.2-12.2*x = 0 // - 63.2
-12.2*x = -63.2 // : -12.2
x = -63.2/(-12.2)
x = 5.18032787
x = 5.18032787
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