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(0,5y+9)*0,8= 0,4y + 7,2
(-2a+4b)*(-1,5)= 3a- 6
b)1\5 (10x+2,5)-0,4= 2x+0,5-0,4=2x+0,1
1\3 (3y-2,7) = y - 0,9
-2\3 (3,6a-1,5b) = - 2,4a +1