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0.4-0.15x=2.1
We simplify the equation to the form, which is simple to understand
0.4-0.15x=2.1
We move all terms containing x to the left and all other terms to the right.
-0.15x=+2.1-0.4
We simplify left and right side of the equation.
-0.15x=+1.7
We divide both sides of the equation by -0.15 to get x.
x=-11.3333333333
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