Question

find the missing number so that the equation has no solutions. 3x - 10 = \boxed{}x - 15

Explanation:

Step1: Identify no-solution condition

A linear equation $ax+b = cx+d$ has no solutions if $a=c$ and $b
eq d$.

Step2: Match coefficients

Here $a=3$, so we set the missing coefficient equal to $3$. Verify $-10
eq -15$, which holds true.

Answer:

$3$