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25=0.4x-0.9x
We move all terms to the left:
25-(0.4x-0.9x)=0
We add all the numbers together, and all the variables
-(-0.5x)+25=0
We get rid of parentheses
0.5x+25=0
We move all terms containing x to the left, all other terms to the right
0.5x=-25
x=-25/0.5
x=-50
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