An number with a x after mean multiply, so it would be 4x12=48
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If: 4x-4 = 12 Then: x = 4
If: 4x+(-12) = 8 then 4x = 20 and x = 5
4x+3y = 12 3y = -4x+12 y = -4/3x+4
-5x + x + 9 = -4x + 12 -4x + 9 = -4x + 12 9 = 12 This equation has no solution.
An algebraic expression doesn't have an equal sign (e.g. 4x+7) whereas an algebraic equation does (e.g. 4x+7=19). 4x=19-7 4x=12 x=12/4 x=3