(15-x): 10 = 17:18

(15-x): 10 = 17:18


The original formula can be converted to 15-x = 170 / 18
x=15-170/18=50/9



15+10%x=18
solve equations


15+10%x=18
10%x=18-5
10%x=3
x=3/0.1
x=30
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