Question

решите уравнения (только ответы)

Answer 1

$2x-4=14\\2x=18\\x=9$

$\frac{6y+124}{4}+1=20\\\frac{6y+124}{4}=19\\\frac{4\left(6y+124\right)}{4}=19\cdot \:4\\6y+124=76\\y=-8$

$\frac{8c-138}{14}+12=1\\\frac{8c-138}{14}=-11\\\frac{14\left(8c-138\right)}{14}=14\left(-11\right)\\8c-138=-154\\8c=-16\\c=-2$

$\frac{2x}{3}+7=1\\\frac{2x}{3}=-6\\\frac{3\cdot \:2x}{3}=3\left(-6\right)\\2x=-18\\x=-9$

$\frac{7x}{\:9}=\frac{49}{9} \\\frac{9\cdot \:7x}{9}=\frac{49\cdot \:9}{9}\\7x=49\\x=7$