100-(307.3-20.4x):2.6=99.5;
260-307.3+20.4x=258.7;
20.4x=258.7-260+307.3;
20.4x=306;
x=306:20.4;
x=15
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100-(307.3-20.4x):2.6=99.5;
260-307.3+20.4x=258.7;
20.4x=258.7-260+307.3;
20.4x=306;
x=306:20.4;
x=15