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b) 1/5(10x+2,5)-0,4 = 2x+0,5-0,4 = 2x+0,1
a) 0,2(10x-y)*0.4= (2x- 0,2y)*0,4= 0,8x- 0,08y
b)1/5(10x+2,5)-0,4= 2x +0,5 - 0,4 = 2x+0,1