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6.4+x=8.5
We simplify the equation to the form, which is simple to understand
6.4+x=8.5
We move all terms containing x to the left and all other terms to the right.
+1x=+8.5-6.4
We simplify left and right side of the equation.
+1x=+2.1
We divide both sides of the equation by 1 to get x.
x=2.1
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