0.2t+1.7t-0.54=0.22_______5.6 z - 2z-0.7+2.65=7
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0,2t+1,7t-0,54=0,22; 1,9t=0,22+0,54; 1,9t=0,76; t=0,4_________________ 5,6z-2z-0,7+2,65=7; 3,6z=7-1,95; 3,6z=5,05; z=101/20:18/5; z=101/(4×18); z=101/72; z=1_29/72