The answer to your question, as asked, is that it is a linear equation with one variable, x.
3x + 3 = 9
Subtract 3 from both sides: 3x = 6
Divide both sides by 3: x = 2
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3x+5=14 3x=9 x=3
the answer is -3x = 0
-3x + 2y = 9 2y = 3x + 9y = 1,5x + 4,5
3a + 9 =3X(a + 3)
5x + 8 = 3x + 25x - 3x = 2 - 82x = -6x = -6/2x = -3Check:5(-3) + 8 = 3(-3) + 2-15 + 8 = -9 + 2-7 = -7