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(-4/5)*x-(3/20) = 7/20 // - 7/20
(-4/5)*x-(3/20)-(7/20) = 0
(-4/5)*x-3/20-7/20 = 0
-4/5*x-1/2 = 0 // + 1/2
-4/5*x = 1/2 // : -4/5
x = 1/2/(-4/5)
x = -5/8
x = -5/8
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