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x in (-oo:+oo)
3-((2/9)*b) = (1/3)*v-7 // - (1/3)*v-7
3-((2/9)*b)-((1/3)*v)+7 = 0
(-2/9)*b+(-1/3)*v+3+7 = 0
10-2/9*b-1/3*v = 0
x naleu017Cy do R
x in (-oo:+oo)
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