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x in (-oo:+oo)
(2/3)*x+7 = (-4/5)*x-1 // - (-4/5)*x-1
(2/3)*x-((-4/5)*x)+1+7 = 0
(2/3)*x+(4/5)*x+1+7 = 0
22/15*x+8 = 0 // - 8
22/15*x = -8 // : 22/15
x = -8/22/15
x = -60/11
x = -60/11
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