$$7x-11 = 2(3x+5)$$
Answer
$$ x = 21 $$
Explanation
$$ \begin{aligned} 7x-11 &= 2(3x+5)&& \text{simplify right side} \\[1 em]7x-11 &= 6x+10&& \text{move the $ \color{blue}{ 6x } $ to the left side and $ \color{blue}{ -11 }$ to the right} \\[1 em]7x-6x &= 10+11&& \text{simplify left and right hand side} \\[1 em]x &= 21&& \\[1 em]x &= 21&& \\[1 em] \end{aligned} $$
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