Well, isn't that a happy little math problem! To find 3x plus 12, you simply need to multiply 3 by the value of x and then add 12 to the result. It's like painting a beautiful landscape, just follow the steps and you'll have your answer in no time.
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3x + 12 is an algebraic expression.
An algebraic expression involves variables, constants or both.
3x+12=x+48: 3x-x=-12+48 2x=36 x=18
3x + 12 = 42 3x = 30 x = 10
7x + 16 = 3x + 4 4x = -12 x = -3
6x^2 +32x +12 -4x -3x^2 -36 = 3x^2 +28x -24 simplified
3x + 4 = 16 3x = 16 - 4 x = 12/3 x = 4