$$2x^2+6x+1+3x^2+3x+9 = 13x^2+9x+10$$
Answer
$$ x = 0 $$
Explanation
$$ \begin{aligned} 2x^2+6x+1+3x^2+3x+9 &= 13x^2+9x+10&& \text{simplify left side} \\[1 em]5x^2+9x+10 &= 13x^2+9x+10&& \text{move all terms to the left hand side } \\[1 em]5x^2+9x+10-13x^2-9x-10 &= 0&& \text{simplify left side} \\[1 em]5x^2+9x+10-13x^2-9x-10 &= 0&& \\[1 em]-8x^2 &= 0&& \\[1 em] \end{aligned} $$
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