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(1/4)*(x-7) = 3*x+1 // - 3*x+1
(1/4)*(x-7)-(3*x)-1 = 0
(1/4)*(x-7)-3*x-1 = 0
1/4*(x-7)-3*x-1 = 0
1/4*(x-7)-3*x-1 = 0
-11/4*x-7/4-1 = 0
-11/4*x-11/4 = 0
-11/4*x-11/4 = 0
-11/4*x-11/4 = 0 // + 11/4
-11/4*x = 11/4 // : -11/4
x = 11/4/(-11/4)
x = -1
x = -1
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