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