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87=-0.4x+170
We move all terms to the left:
87-(-0.4x+170)=0
We get rid of parentheses
0.4x-170+87=0
We add all the numbers together, and all the variables
0.4x-83=0
We move all terms containing x to the left, all other terms to the right
0.4x=83
x=83/0.4
x=207+0.2/0.4
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