Упростите выражения (-0,7х+0,6у)5-3(0,4у-1,5х)
1. 5(-0.7х + 0.6у) - 3(0.4у - 1.5х)=
=-3.5х+3у-1.2у+4.5х=
=х+1.8у
2. 0.4(х-9)-0.3(х+2)=0.7
0.4х-3.6-0.3х-0.6=0.7
0.1х=4.9
х=49
(-0.7х+0.6у)5-3(0,4у-1.5х)=-3.5х+3у-1.2у+4.5х=х+1,8у