Question

Como resolver a equação : 2x/5 - 4=7x- 8

Answer 1

$\dfrac{2x}{5} - 4 = 7x-8 \\\\ = \dfrac{2x\cdot1 -4\cdot5 }{5\cdot1} = 7x-8\\\\ = 2x-20 = (7x-8)5 \\\\ = 2x - 20 = 35x-40\\\\ 35x - 2x = -20 + 40\\\\ 33x = 20\\\\ x = \dfrac{20}{33}$