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b=14+2•a
c=b÷2
a, b, c=?
a+2•a+14+(14+2•a):2=109
3•a+14+14: 2+2•a: 2=109
3•a+14+7+a=109
4•a+21=109
4•a=109-21
4•a=88
a=88: 4
a=22