x - 12 = 3
Add '12' to both sides
x = 3 + 12
x = 15
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minus 21 think of it as 12+9 which equals 21 then just whack a minus sign infront
12 minus 1/3 equals 11 and 2/3.
12
If a equals 3 and b equals minus 5 then a minus b equals what
12.