Answer:
-10a - 4b + 69
Step-by-step explanation:
Let the number be x.
[tex]\rm 3a + 6b - 52 + x = -7a + 2b + 17[/tex]
[tex]\implies \rm x = (-7a + 2b + 17) - (3a + 6b - 52)[/tex]
[tex]\implies \rm x = -7a + 2b + 17 - 3a - 6b + 52[/tex]
[tex]\implies \rm x = -7a - 3a + 2b - 6b + 17 + 52[/tex]
[tex]\implies \boxed{ \rm x = -10a - 4b + 69}[/tex]
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