[tex]4*\frac{1}{2} *(-3.5)+8*\frac{1}{2} -7*(-3.5)-14=-7+4+24.5-14=7.5[/tex]
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[tex]4*\frac{1}{2} *(-3.5)+8*\frac{1}{2} -7*(-3.5)-14=-7+4+24.5-14=7.5[/tex]