1 и 3 не нужно. Помогите пожалуйста

$(4.6 - x) \times 19 = 4.18 \\ \\ 87.4 - 19x = 4.18 \\ \\ - 19x = 4.18 - 87 .4 \\ \\ - 19x = - 83.22 \\ \\ x = - 83.22 \div ( - 19) \\ \\ x = 4.38 \\ \\ \\ \\ 2)17.28 \div (56 - x) = 36 \\ \\ \frac{432}{25} \times \frac{1}{56 - x} = 36 \\ \\ \frac{432}{25(56 -x )} = 36 \\ \\ 432 = 900 \times (56 - x) \\ \\ 432 = 50400 - 900x \\ \\ 900x = 50400 - 432 \\ \\ 900x = 49968 \\ \\ x = \frac{1388}{25} = 55.22$
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