Question

0.8(х-2)-0.7(х-1)=27 решите срочно

Answer 1

0.8(х-2)-0.7(х-1)=27
0.8х-1.6-0.7х+0.7=27
0.8х-0.7х=27+1.6-0.7
0.1х=27.9
х=27.9:0.1
х=279