15х(а+4)-55=35
15х×а+25х×4
15ах+60х-55=35
15ах+60х=35+55
15ах+60х=90
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15х(а+4)-55=35
15х×а+25х×4
15ах+60х-55=35
15ах+60х=35+55
15ах+60х=90