X÷5=7÷1/2 x×1/2=5×7 1/2x=5×7 1/2x=35 x=35×1/2 x=70
x : 5 = 7 : 1/2
x : 5 = 7 * 2
x : 5 = 14
x = 14 * 5
x = 70
Ответ: {70}
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Или так:
x * 1/2 = 7 * 5
x : 2 = 35
x = 35 * 2