Answer:
D
Step-by-step explanation:
Answer: 11.4
Step-by-step explanation:
change to numbers 
simplify 
Answer:
x = - 90
Step-by-step explanation:
Given
10x + 60 = 9x - 30 ( subtract 9x from both sides )
x + 60 = - 30 ( subtract 60 from both sides )
x = - 90
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It’s b here is proof of what i got