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x in (-oo:+oo)
4-x = 6*x-38 // - 6*x-38
4-x-(6*x)+38 = 0
4-x-6*x+38 = 0
42-7*x = 0 // - 42
-7*x = -42 // : -7
x = -42/(-7)
x = 6
x = 6
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