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x/5 = -1.2/4 // + -1.2/4
x/5-(-1.2/4) = 0
x/5+0.3 = 0
1/5*x+0.3 = 0 // - 0.3
1/5*x = -0.3 // : 1/5
x = -0.3/1/5
x = -1.5
x = -1.5
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