Answer:
[tex]21 - 3 + 18 \times 7 \\ 21 - 3 + 126 \\ 21 + 123 \\ 144[/tex]
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[tex]\sf21 - 3 + 18 \times 7[/tex]
[tex] \sf = 21 - 3 + 126[/tex]
[tex] \sf = 147 - 3[/tex]
[tex] \sf = 144[/tex]
