heike hoffmann
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heike's activity
heike hoffmann on Simultaneous equations: elimination 5 years ago
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heike hoffmann on Solving linear equations: collecting like terms and solving 5 years ago
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heike hoffmann on Algebra VIII: solving simultaneous equations (equate & substitute) 5 years ago
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heike hoffmann on Algebra VIII: solving simultaneous equations (by elimination) 5 years ago
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