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15=210-4x
We simplify the equation to the form, which is simple to understand
15=210-4x
We move all terms containing x to the left and all other terms to the right.
+4x=+210-15
We simplify left and right side of the equation.
+4x=+195
We divide both sides of the equation by 04 to get x.
x=48.75
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