100-(307,3-20,4х):2,6=99,5 Помогите найти "х"

100-(307,3-20,4х):2,6=99,5(307,3-20,4х):2,6=99,5-100(307,3-20,4х):2,6=-0,5307,3-20,4х=-1,320,4х=307,3-1,320,4х=306х=306/20,4х=15