Ответы на вопрос:
250 + a = 500 a = 500 - 250 a = 250 === 800 - c = 640 c = 800 - 640 c = 160 === (x + 10) - 10 = 50 x + 10 - 10 = 50 x = 50 === y - 16 = 68 + 16 y = 68
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