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(5/6)*(x-9)+(3/4)*(x-1) = -13 // + 13
(5/6)*(x-9)+(3/4)*(x-1)+13 = 0
5/6*(x-9)+3/4*(x-1)+13 = 0
5/6*(x-9)+3/4*(x-1)+13 = 0
19/12*x-33/4+13 = 0
19/12*x+19/4 = 0
19/12*x+19/4 = 0
19/12*x+19/4 = 0 // - 19/4
19/12*x = -19/4 // : 19/12
x = -19/4/19/12
x = -3
x = -3
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