why is the first step when solving 2x-15-4x=3 to combine like terms?

Because there are like terms (the variables) on the same side of the equation. Because there are like terms (the variables) on the same side of the equation. Because there are like terms (the constants) on the same side of the equation. Because there are like terms (the constants) on the same side of the equation. Because there are like terms (the variables) on opposite sides of the equation. Because there are like terms (the variables) on opposite sides of the equation. Because there are like terms (the constants) on opposite sides of the equation. Because there are like terms (the constants) on opposite s

is it opsisite side

Yes, the correct option is "Because there are like terms (the variables) on opposite sides of the equation." When solving the equation 2x - 15 - 4x = 3, the like terms (in this case, the variables) need to be combined on opposite sides before further simplifying the equation.