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x in (-oo:+oo)
(-1/2)*x+3/10 = -1/5 // + -1/5
(-1/2)*x+3/10-(-1/5) = 0
(-1/2)*x+3/10+1/5 = 0
1/2-1/2*x = 0 // - 1/2
-1/2*x = -1/2 // : -1/2
x = -1/2/(-1/2)
x = 1
x = 1
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