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Q51: <span class="ql-formula" data-value="\left\{ \begin{array} { r }
Q71: <span class="ql-formula" data-value="\left\{ \begin{aligned}3 x - 4
Q111: <span class="ql-formula" data-value="y ^ { 3 }
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Q185: <span class="ql-formula" data-value="4 x + y =
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Q238: <span class="ql-formula" data-value="16 z - 2"><span class="katex"><span
Q255: The expression <span class="ql-formula" data-value="a
Q261: <span class="ql-formula" data-value="- 10 x - 11
Q286: <span class="ql-formula" data-value="\frac { \frac { 1