Solve for x
x=70
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100\left(x+2x\right)=10500\times 2
Multiply both sides by 2.
100\times 3x=10500\times 2
Combine x and 2x to get 3x.
300x=10500\times 2
Multiply 100 and 3 to get 300.
300x=21000
Multiply 10500 and 2 to get 21000.
x=\frac{21000}{300}
Divide both sides by 300.
x=70
Divide 21000 by 300 to get 70.
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