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x in (-oo:+oo)
48 = 2*x+7*x+3 // - 2*x+7*x+3
48-(2*x)-(7*x)-3 = 0
48-2*x-7*x-3 = 0
45-9*x = 0 // - 45
-9*x = -45 // : -9
x = -45/(-9)
x = 5
x = 5
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