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36000\times 12=\frac{1200000\times 9}{100}x
Multiply both sides by 12.
3600000\times 12=1200000\times 9x
Multiply both sides of the equation by 100.
43200000=1200000\times 9x
Multiply 3600000 and 12 to get 43200000.
43200000=10800000x
Multiply 1200000 and 9 to get 10800000.
10800000x=43200000
Swap sides so that all variable terms are on the left hand side.
x=\frac{43200000}{10800000}
Divide both sides by 10800000.
x=4
Divide 43200000 by 10800000 to get 4.