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x in (-oo:+oo)
x/5-7 = 2*q*x // - 2*q*x
x/5-(2*q*x)-7 = 0
x/5-2*q*x-7 = 0
1/5*x-7 = 0 // + 7
1/5*x = 7 // : 1/5
x = 7/1/5
x = 35
x = 35
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