How do you solve #(7- d ) + 2.8= 7.7#?

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Answer 1 · 2017-05-16T12:03:54

See a solution process below:

First, combine like terms on the left side of the equation:

#(7 - d) + 2.8 = 7.7#

#7 - d + 2.8 = 7.7#

#-d + 2.8 + 7 = 7.7#

#-d + 9.8 = 7.7#

Next, subtract #color(red)(9.8)# from each side of the equation to isolate the #d# term while keeping the equation balanced:

#-d + 9.8 - color(red)(9.8) = 7.7 - color(red)(9.8)#

#-d + 0 = -2.1#

#-d = -2.1#

Now, multiply each side of the equation by #color(red)(-1)# to solve for #d# while keeping the equation balanced:

#color(red)(-1) xx -d = color(red)(-1) xx -2.1#

#d = 2.1#