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50 = (-21/4)*(x-10) // - (-21/4)*(x-10)
50-((-21/4)*(x-10)) = 0
(21/4)*(x-10)+50 = 0
21/4*(x-10)+50 = 0
21/4*(x-10)+50 = 0
21/4*x-5/2 = 0
21/4*x-5/2 = 0
21/4*x-5/2 = 0 // + 5/2
21/4*x = 5/2 // : 21/4
x = 5/2/21/4
x = 10/21
x = 10/21
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