Assuming the equation is 3x=15, you just need to divide each side of the equation by three. On the left, x times three divided by three is one times x, or just x. On the right side, fifteen divided by three is five. So you are left with x=5.
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Do you mean 3x = 45 then if so divided both sides by 3 to find the value of x which is 15
Add 5 to both sides of the equation to get rid of the - 5. -3x - 5 + 5 = -20 + 5 Solve and simplify. -3x = -15 Divide both sides of the equation by -3. x = 5
8-3x = 128 -3x = 128-8 -3x = 120 x = -40
3x = (96-75) 3x = 21So X = 7
If 15 + 3x = 42, then x = 9