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a in (-oo:+oo)
48 = 2*a+2*a+8 // - 2*a+2*a+8
48-(2*a)-(2*a)-8 = 0
48-2*a-2*a-8 = 0
40-4*a = 0 // - 40
-4*a = -40 // : -4
a = -40/(-4)
a = 10
a = 10
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