y×36+6672=30000; y×36=30000-6672; y×36=23 328; y=23328÷36; y=648;
648×36+6672=30000;
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y×36+6672=30000; y×36=30000-6672; y×36=23 328; y=23328÷36; y=648;
648×36+6672=30000;