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(-2/5)*x+8 = 81/10 // - 81/10
(-2/5)*x-(81/10)+8 = 0
(-2/5)*x-81/10+8 = 0
-2/5*x-1/10 = 0 // + 1/10
-2/5*x = 1/10 // : -2/5
x = 1/10/(-2/5)
x = -1/4
x = -1/4
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