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a in (-oo:+oo)
4*(10-a) = 4 // - 4
4*(10-a)-4 = 0
4*(10-a)-4 = 0
36-4*a = 0
36-4*a = 0
36-4*a = 0 // - 36
-4*a = -36 // : -4
a = -36/(-4)
a = 9
a = 9
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