1) 3,4х+1,6-1,8х-2 = 1,6х-0,4
2) 5*(1,8х+1,2)-12 = 9х-6
3) -3 1/2у * 4х = -3,5у*4х
4) 4*(х-2у)-3*(2х+у)-2х = 4х-8у-6х-3у-2х = -4х-11у
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Answers & Comments
1) 3,4х+1,6-1,8х-2 = 1,6х-0,4
2) 5*(1,8х+1,2)-12 = 9х-6
3) -3 1/2у * 4х = -3,5у*4х
4) 4*(х-2у)-3*(2х+у)-2х = 4х-8у-6х-3у-2х = -4х-11у