считаем: 516+х+х+55-5=742
2х+516+50=742
2х+566=742
2х=742-566
2х=176
х=88
Ответ:88
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считаем: 516+х+х+55-5=742
2х+516+50=742
2х+566=742
2х=742-566
2х=176
х=88
Ответ:88
2x=742+5-55-455
2x=237
x=118,5