Question
$$37+x\cdot7+40 = 420$$
Answer
$$ x = 49 $$
Explanation
$$ \begin{aligned} 37+x\cdot7+40 &= 420&& \text{simplify left side} \\[1 em]37+x\cdot7+40 &= 420&& \\[1 em]7x+77 &= 420&& \text{ move 77 to the right } \\[1 em]7x &= 420-77&& \\[1 em]7x &= 343&& \text{ divide both sides by $ 7 $ } \\[1 em]x &= \frac{343}{7}&& \\[1 em]x &= 49&& \\[1 em] \end{aligned} $$
This page was created using
Equations Solver