Question

find the missing number so that the equation has no solutions. 3x - 10 = □x - 15

Explanation:

Step1: Match x coefficients

For the equation $ax + b = cx + d$ to have no solutions, $a=c$ and $b
eq d$. Here set the missing coefficient equal to 3.

Step2: Verify no solutions

Substitute 3 into the equation: $3x -10 = 3x -15$. Subtract $3x$ from both sides: $-10 = -15$, which is a false statement.

Answer:

$3$