What is #-21-8a=-5(a+6)#?

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Answer 1 · 2016-08-22T16:03:35

#a=3#

#-21-8a=-5(a+6)#
#color(white)(.)#

Multiply out the bracket

#-21-8a=-5a-30#

#color(white)(.)#

Collecting like terms

#8a-5a=30-21#

#color(white)(.)#

Simplifying

#3a=9#

#color(white)(.)#

Divide both sides by 3

#a=9/3#

#color(white)(.)#

But #9-:3=3# giving

#a=3#