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x in (-oo:+oo)
(4/5)*x-((3/4)*x) = 3/10-1 // - 3/10-1
(4/5)*x-((3/4)*x)-(3/10)+1 = 0
(4/5)*x+(-3/4)*x-3/10+1 = 0
1/20*x+7/10 = 0 // - 7/10
1/20*x = -7/10 // : 1/20
x = -7/10/1/20
x = -14
x = -14
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