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[tex] {x}^{48} \div \frac{ {x}^{51} }{( { {x}^{12} )}^{2} } - {(x \times {x}^{60}) }^{0} + {( {x}^{3} )}^{4} \div ( { {x}^{4}) }^{3} = {x}^{48} \div \frac{ {x}^{51} }{ {x}^{24} } - 1 + {x}^{12} \div {x}^{12} = {x}^{48} \div {x}^{27} - 1 + {x}^{0} = {x}^{21} - 1 + 1 = {x}^{21} [/tex]
[tex] {x}^{21} = {( - 1)}^{21} = - 1[/tex]