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1). Нет, если мы подставим эти числа в уравнение, то получим: 2*3+(-5)=6-5=1, а не 7, как нам задано в условии.
2). Да, подставив числа получим: 2*4+(-1)=8-1=7, получилось столько, сколько там надо в условии, поэтому этот вариант нам подходит.