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3-4=2/5(-1-k)
We simplify the equation to the form, which is simple to understand
3-4=2/5(-1-k)
Reorder the terms in parentheses
3-4=+(-0.4-0.4k)
Remove unnecessary parentheses
+3-4=-0.4-0.4k
We move all terms containing k to the left and all other terms to the right.
+ 0.4k=-0.4-3+4
We simplify left and right side of the equation.
+ 0.4k=0.6
We divide both sides of the equation by 00.4 to get k.
k=1.5
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