Question

calcule as seguintes equações

3x+5=8

10x-19=21

2x-7=-10​

Answer 1

$\sf3x+5=8$

$\sf3x=8-5$

$\sf3x=3$

$\boxed{\boxed{\sf x=1}}$

$\sf10x-19=21$

$\sf10x=21+19$

$\sf10x=40$

$\boxed{\boxed{\sf x=4}}$

$\sf2x-7=-10$

$\sf2x=-10+7$

$\sf2x=-3$

$\boxed{\boxed{\sf x=-\dfrac{3}{2}}}$