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x in (-oo:+oo)
(1/4)*(x-7) = (1/15)*(4*x-1) // - (1/15)*(4*x-1)
(1/4)*(x-7)-((1/15)*(4*x-1)) = 0
(1/4)*(x-7)+(-1/15)*(4*x-1) = 0
1/4*(x-7)-1/15*(4*x-1) = 0
1/4*(x-7)-1/15*(4*x-1) = 0
-1/60*x-101/60 = 0
-1/60*x-101/60 = 0
-1/60*x-101/60 = 0 // + 101/60
-1/60*x = 101/60 // : -1/60
x = 101/60/(-1/60)
x = -101
x = -101
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