×* 3/5=4/15
×÷2/7=7/12
2/3*×=4/7
помогите с уравниями плиз
* умножить

x * 3/5 = 4/15
x = 4/15 : 3/5
x = 4/15 * 5/3
x = 4/3 * 1/3
x = 4/9
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x : 2/7 = 7/12
x = 7/12 * 2/7
x = 1/6
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2/3 * x = 4/7
x = 4/7 : 2/3
x = 4/7 * 3/2
x = 2/7 * 3/1
x = 6/7