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y- syn (10)
x-5=5(y-5)
x+10=2(y+10)
x=5y-25+5
x=5y-20
5y-20+10=2(y+10)
5y-2y=20+20-10
3y=30
y=10
x=5y-20
x=5*10-20
x=30