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2.1x-1.08=.42-5.4x
We simplify the equation to the form, which is simple to understand
2.1x-1.08=.42-5.4x
We move all terms containing x to the left and all other terms to the right.
+2.1x+5.4x=0.42+1.08
We simplify left and right side of the equation.
+7.5x=+1.5
We divide both sides of the equation by 7.5 to get x.
x=0.2
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