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0.4*x-0.6 = -(x/5)-0.2 // + -(x/5)-0.2
0.4*x+x/5-0.6+0.2 = 0
0.6*x-0.4 = 0 // + 0.4
0.6*x = 0.4 // : 0.6
x = 0.4/0.6
x = 0.66666667
x = 0.66666667
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