304,2решите...........

Question

304,2решите...........

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Answer 1

А)0.4(6х-7)=0.5(3х+7)
2.4х-2.8=1.5+3.5
2.4х-1.5х=3.5+2.8
0.9х=6.3
х=7
б)7(1,4у+1,8)-27,6=10,1у
9,8у+12,6-27,6=10,1у
9,8у-15=10,1у
9,8у-10,1у=15
-0,3у=15
у=-50