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0.4x-77=90
We move all terms to the left:
0.4x-77-(90)=0
We add all the numbers together, and all the variables
0.4x-167=0
We move all terms containing x to the left, all other terms to the right
0.4x=167
x=167/0.4
x=417+0.19999999999999/0.4
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