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30\times 7,7=x\left(7\times 14+8\times 11+9\times 3\right)
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 30x, the least common multiple of 1\left(x+0\right);30.
231=x\left(7\times 14+8\times 11+9\times 3\right)
Multiply 30 and 7,7 to get 231.
231=x\left(7\times 14\right)+x\left(8\times 11\right)+x\left(9\times 3\right)
Use the distributive property to multiply x by 7\times 14+8\times 11+9\times 3.
x\left(7\times 14\right)+x\left(8\times 11\right)+x\left(9\times 3\right)=231
Swap sides so that all variable terms are on the left hand side.
\left(7\times 14+8\times 11+9\times 3\right)x=231
Combine all terms containing x.
213x=231
The equation is in standard form.
\frac{213x}{213}=\frac{231}{213}
Divide both sides by 213.
x=\frac{231}{213}
Dividing by 213 undoes the multiplication by 213.
x=\frac{77}{71}
Reduce the fraction \frac{231}{213} to lowest terms by extracting and canceling out 3.