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x in (-oo:+oo)
(-x-7)/3 = 5 // - 5
(-x-7)/3-5 = 0
(-x-7)/3+(-5*3)/3 = 0
-x-5*3-7 = 0
-x-22 = 0
(-x-22)/3 = 0
(-x-22)/3 = 0 // * 3
-x-22 = 0
-x-22 = 0 // + 22
-x = 22 // * -1
x = -22
x = -22
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