Question

La propiedad resolver 15+(-8+x)=[15+(-8)]+(-7)

Answer 1

$15+\left(-8+x\right)=\left(15+\left(-8\right)\right)+\left(-7\right)$

$15-8+x=\left(15-\left8\right\right)-\left7\right$

$7+x=7-7$

$x+7=0$

$x=-7$