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2100x-1800=2400
We simplify the equation to the form, which is simple to understand
2100x-1800=2400
We move all terms containing x to the left and all other terms to the right.
+2100x=+2400+1800
We simplify left and right side of the equation.
+2100x=+4200
We divide both sides of the equation by 2100 to get x.
x=2
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