First off the answer to the problem is 3x^7 Multiply 3 3 by −7<span> - </span>7<span> to get −21 - 21 . Move all terms containing </span>x x<span> to the left side of the equation. Since 3</span>x<span> 3 </span>x<span> contains the variable to </span>solve<span> for, move it to the left side of the equation by subtracting 3</span>x<span> 3 </span>x<span> from both sides. Subtract 3</span>x<span> 3 </span>x<span> from 3</span>x<span> 3 </span>x<span>to get 0 0 hope it helped =)</span>