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(1/2)*x+1/5 = -3 // + 3
(1/2)*x+1/5+3 = 0
1/2*x+16/5 = 0 // - 16/5
1/2*x = -16/5 // : 1/2
x = -16/5/1/2
x = -32/5
x = -32/5
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