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1.2k+20=140
We simplify the equation to the form, which is simple to understand
1.2k+20=140
We move all terms containing k to the left and all other terms to the right.
+1.2k=+140-20
We simplify left and right side of the equation.
+1.2k=+120
We divide both sides of the equation by 1.2 to get k.
k=100
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