How do you solve #7x - 4+ x = 12#?

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Answer 1 · 2016-11-07T03:28:11

Combine like terms.

#stackrel("add")overbrace(7x + x) - 4 = 12#

#8x - 4 = 12#

Move the #-4# over to the other side by adding #4# to both sides.

#8x - 4# #color(green)( + 4) = 16# #color(green)( + 4)#

Divide by #8# to get #x# by itself.

#color(blue)(x) = 16/8 = color(blue)(2)#

You can also check your answer:

#7(2) - 4 + (2) stackrel(?)(=) 12#

#14 - 4 + 2 = 10 + 2 = 12# #color(blue)(sqrt"")#