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6x+5.4*4=42
We simplify the equation to the form, which is simple to understand
6x+5.4*4=42
We move all terms containing x to the left and all other terms to the right.
+6x=+42-21.6
We simplify left and right side of the equation.
+6x=+20.4
We divide both sides of the equation by 6 to get x.
x=3.4
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