How do you solve #( 4f + 5 ) + ( 5f + 40 ) = 180#?

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Answer 1 · 2015-10-02T13:35:10

#color(blue)(f=15#

# (4f+5)+(5f+40)=180#

# (4f+5f)+(5+40)=180#

# 9f + 45 =180#

# 9f =180 - 45#

# 9f =135#

# f =135/9#

#color(blue)(f=15#