If 3x equals 72 then you would have to take 3x divided by three and 72 divided by 3 because you have to do it to the same side. So if 3x=72 then x would equal 24.
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If you mean: 3x+2y = 16 then it is y = -1.5x+8
If you mean: y = 3x+1 then the value of y will equal 10
If you mean: x^2+15-3x then its value is 19 when x equals 4
If: 3x = 15 Then: x = 5
2x+3x = 5x