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x in (-oo:+oo)
X/3 = x/4-7 // - x/4-7
X/3-(x/4)+7 = 0
1/3*X-1/4*x+7 = 0 // - 1/3*X+7
-1/4*x = -(1/3*X+7) // : -1/4
x = (-(1/3*X+7))/(-1/4)
x = 4*(1/3*X+7)
x = 4*(1/3*X+7)
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