How do you solve #(4x+10)+(x+20)=90#?

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Answer 1 · 2018-04-02T18:31:40

#x=12#

As the only signs are 'plus' the brackets serve no purpose. So we can discard them giving:

#4x+10+x+20=90#

Regrouping

#ubrace(4x+x)+ubrace(10+20)=90#

#color(white)("dd")5xcolor(white)(".d")+color(white)("dd")30color(white)("dd")=90#

Subtract 30 from both sides

#5x=60#

Divide both sides by 5

#x=12#