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a in (-oo:+oo)
(-a-3)/3 = 10 // - 10
(-a-3)/3-10 = 0
(-a-3)/3+(-10*3)/3 = 0
-a-10*3-3 = 0
-a-33 = 0
(-a-33)/3 = 0
(-a-33)/3 = 0 // * 3
-a-33 = 0
-a-33 = 0 // + 33
-a = 33 // * -1
a = -33
a = -33
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