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x in (-oo:+oo)
W/5-7 = (-4*w)/5 // - (-4*w)/5
W/5-((-4*w)/5)-7 = 0
W/5+(4/5)*w-7 = 0
1/5*W+4/5*w-7 = 0
x naleu017Cy do R
x in (-oo:+oo)
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