The number of buttons an industrial button machine can manufacture each hour, y, varies directly with the number of active hours
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Multiply 140 on both sides to get "x" by itself
8 = x
You can think of this equation as 
and thus apply the transformations to it as such
1) D = 2, C = +3
2) D = -12, C = -2
3) C = +6, D = 3
4) C = -7, D = -7
and thus apply the transformations to it as such
1) D = 2, C = +3
2) D = -12, C = -2
3) C = +6, D = 3
4) C = -7, D = -7