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x in (-oo:+oo)
3*(1/4+5) = 63*x // - 63*x
3*(1/4+5)-(63*x) = 0
3*(1/4+5)-63*x = 0
63/4-63*x = 0 // - 63/4
-63*x = -63/4 // : -63
x = -63/4/(-63)
x = 1/4
x = 1/4
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