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3x = 15 - 3
3x = 12
x = 12/3
x = 4
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4x - 5 = 19
4x = 19+5
4x = 24
x = 24/4
x = 6
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x - 7 = 9
x = 9+7
x = 16
-------------------------------------------------
5x + 3 = 28
5x = 28 -3
5x = 25
x = 25/5
x = 4
----------------------------------------------------
x +9 = 15
x = 15 -9
x = 6
-----------------------------------------------------
x +10 = 11
x = 11 -10
x = 1