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Q19: 5x + 7y = 8<br>A)y is a
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Q136: <span class="ql-formula" data-value="9 x - y =
Q177: The half-life of silicon-32 is 710 years.
Q180: <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB1195/.jpg" alt=" A)