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0.08x + 0.09(x+400)=138
We simplify the equation to the form, which is simple to understand
0.08x + 0.09(x+400)=138
Reorder the terms in parentheses
0.08x+( + 0.09x+36)=138
Remove unnecessary parentheses
+ 0.08x + 0.09x+36=+138
We move all terms containing x to the left and all other terms to the right.
+ 0.08x + 0.09x=+138-36
We simplify left and right side of the equation.
+ 0.17x=+102
We divide both sides of the equation by 0.17 to get x.
x=600
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