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4/5-((1/2)*x) = -1.2 // + 1.2
4/5-((1/2)*x)+1.2 = 0
(-1/2)*x+4/5+1.2 = 0
2-1/2*x = 0 // - 2
-1/2*x = -2 // : -1/2
x = -2/(-1/2)
x = 4
x = 4
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