212-150=62
ответ: 62
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3/4+1 3/8=3/4+11/8=(6+11)/8=17/8
1 3/5*17/8=8/5*17/8=17/5=3 2/5
Фото/////////////////////////////////
5(х-3)-2(х-7)+7(2х+6)=7
5х-15-2х+14+14х+42=7
5х-2х+14х=7+15-14-42
17х=-34
х=-34/17
х=-2
-9х=70.317
х=70.317:(-9)
х=7813
проверка
-9*7813=70317