а)1,4*(3-x)-0,9(x+2)=4,7
4.2-1.4x-0.9x-1.8=4.7
2.4-4.7=2.3х
-2.3=2.3х
х=-1
прости если ошиблась!!!
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4.2-1.4x-0.9x-1.8=4.7
2.4-4.7=2.3х
-2.3=2.3х
х=-1
прости если ошиблась!!!