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