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.4z+8=12
We simplify the equation to the form, which is simple to understand
.4z+8=12
We move all terms containing z to the left and all other terms to the right.
+ 0.4z=+12-8
We simplify left and right side of the equation.
+ 0.4z=+4
We divide both sides of the equation by 0.4 to get z.
z=10
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