the number of non-trivial solutions of the system x-y+z=0, 2x+y+3z=0 is?
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Motion and forces.
Conservation of energy and momentum.
Electricity and magnetism.
Heat.
Waves.
Gravity.
Math.
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Motion and forces.
Conservation of energy and momentum.
Electricity and magnetism.
Heat.
Waves.
Gravity.
Math.
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