![m -( m - 1) \div 2 = 5(2t + 1) m -( m - 1) \div 2 = 5(2t + 1)](https://tex.z-dn.net/?f=m+-%28+m+-+1%29+%5Cdiv+2+%3D+5%282t+%2B+1%29)
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hope this helps you :-)
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