Calculate this step by step :7500=3000/1.2-?

75000=3000/1.2-?
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Write this as 7500=3000/(1.2-x).

Multiply both sides by (1.2-x)/7500: 1.2-x=3000/7500=30/75=⅖=0.4.

x=1.2-0.4=0.8 (=⅘).
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