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x in (-oo:+oo)
(-1/4)*x+(3/4)*x-(1/5) = -6/5 // + -6/5
(-1/4)*x+(3/4)*x-(1/5)-(-6/5) = 0
(-1/4)*x+(3/4)*x-1/5+6/5 = 0
1/2*x+1 = 0 // - 1
1/2*x = -1 // : 1/2
x = -1/1/2
x = -2
x = -2
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