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13=z/3(-10)
We move all terms to the left:
13-(z/3(-10))=0
We multiply all the terms by the denominator
-(z+13*3(-10))=0
We calculate terms in parentheses: -(z+13*3(-10)), so:We get rid of parentheses
z+13*3(-10)
We add all the numbers together, and all the variables
z-390
Back to the equation:
-(z-390)
-z+390=0
We add all the numbers together, and all the variables
-1z+390=0
We move all terms containing z to the left, all other terms to the right
-z=-390
z=-390/-1
z=+390
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