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{7+[4.(1)-1]+12}-6
{7+[4-1]+12}-6
{7+3+12}-6
22-6 = 16
{7+[4.1-1]7-4(2-1)-5:5[+3.4}
{7+[4-1]7-4(1)-1[12}
{7+[3]7-4-12}
{7+21-4-12} = 12