Primary school score plus and minus fifth grade simple solution equation, an X Oh, each 50, who has? For example: x-3 / 10 = 1 / 5, 1 / 8 + 8 / 15 + 7 / 8 + 3 / 15, help!

Primary school score plus and minus fifth grade simple solution equation, an X Oh, each 50, who has? For example: x-3 / 10 = 1 / 5, 1 / 8 + 8 / 15 + 7 / 8 + 3 / 15, help!

X=3+5/10
X=2