15 x [(12^2 ÷ 3^2) ÷ 2^2] - [(2)^2]^2 + 7 x 3 - (20^4 ÷ 5^4)^0 - 15^3 ÷ 5^3
15*(4²/2²)-2⁴+21-1-15³/5³=
15*(4²/2²)-2⁴+21-1-3³=
15*4-16+21-1-27=
60-16+21-1-27=37
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