15*(24-х)=90, 24-х=90:15, 24-х=6, х=24-6, х=18
(х-43):4=14, х-43=14*4, х-43=56, х=56+43, х=99
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15*(24-х)=90, 24-х=90:15, 24-х=6, х=24-6, х=18
(х-43):4=14, х-43=14*4, х-43=56, х=56+43, х=99