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82+49+z=180
We simplify the equation to the form, which is simple to understand
82+49+z=180
We move all terms containing z to the left and all other terms to the right.
+1z=+180-82-49
We simplify left and right side of the equation.
+1z=+49
We divide both sides of the equation by 1 to get z.
z=49
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