Isolate the x. Note the equal sign. What you do to one side, you do to the other.
First, multiply 5 to both sides
-2.8(5) = (-x/5)(5)
-2.8(5) = -x
-14 = -x
Isolate the x. Divide -1 from both sides
(-14)/-1 = (-x)/-1
x = -14/-1
x = 14
14 is your answer
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