2/5+3x/10=7/15

I am in eighth grade, and i need help on a math problem. I am confused on how to find what (x) equals.
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1 Answer

(3x/10) +0.4 =7/15

30*(3x/10)+30*0.4=14

or 9x+12=14

9x=2

x=2/9=0.2222222222222222...
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