(X-180)/X=0.3

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(X-180)/X=0.3(X-180)/X=0.3(X-180)/X=0.3x-180=0.3x0.7x=180x=257.1

(X-180)/X=0.3
(X-180)/X=0.3

(X-180)/X=0.3
x-180=0.3x
0.7x=180
x=257.1