13+3,2x +0,4x =40 помогите срочно надо пожалуйста
3.2x + 0.4x = 40 - 13
3.6x=27
x=27/3.6
x=7.5
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3.2x + 0.4x = 40 - 13
3.6x=27
x=27/3.6
x=7.5