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x in (-oo:+oo)
(1/4)*((-5/3)*x+8) = 7 // - 7
(1/4)*((-5/3)*x+8)-7 = 0
1/4*(8-5/3*x)-7 = 0
1/4*(8-5/3*x)-7 = 0
-5/12*x-5 = 0
-5/12*x-5 = 0
-5/12*x-5 = 0 // + 5
-5/12*x = 5 // : -5/12
x = 5/(-5/12)
x = -12
x = -12
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