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x in (-oo:+oo)
x/4+1 = x/7+4 // - x/7+4
x/4-(x/7)-4+1 = 0
3/28*x-3 = 0 // + 3
3/28*x = 3 // : 3/28
x = 3/3/28
x = 28
x = 28
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