use PEMDAS and equality property
PEMDAS
order of operations
Parenthasees
Exponents
Muliplcaiton or division
Addition or subtraction
equality property is x=x or a=a
so pemdas
-5(-6+15)+4=30+x+4
simplify parenthaseese
-6+15=9
now we have
-5(9)+4=30+x+4
Mulitiplcation
-5 times 9=-45
now we have
-45+4=30+x+4
addition
-45+4=-41
we can move the 30 and 4 togeher since addition
30+4=34
now we have
-41=x+34
subtract 34 from bot sides
-75=x
