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(-21/4)*(x-10)+80 = 0
80-21/4*(x-10) = 0
80-21/4*(x-10) = 0
265/2-21/4*x = 0
265/2-21/4*x = 0
265/2-21/4*x = 0 // - 265/2
-21/4*x = -265/2 // : -21/4
x = -265/2/(-21/4)
x = 530/21
x = 530/21
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