1,9х+5,7=0:(-15 1/13)
1,9х+5,7=0
1,9х=0-5,7
Х=-5,7:1,9
Х=-3
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1,9х+5,7=0:(-15 1/13)
1,9х+5,7=0
1,9х=0-5,7
Х=-5,7:1,9
Х=-3