11; 5x-3
12: 5-³t
13:
14: 7x³
15:
16;
17;
18: 882
19: 7-x²
20; 4xy⁵
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11; 5x-3
12: 5-³t
13:
14: 7x³
15:
16;
17;
18: 882
19: 7-x²
20; 4xy⁵