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4(5+z)-6(2+z)=4
We move all terms to the left:
4(5+z)-6(2+z)-(4)=0
We add all the numbers together, and all the variables
4(z+5)-6(z+2)-4=0
We multiply parentheses
4z-6z+20-12-4=0
We add all the numbers together, and all the variables
-2z+4=0
We move all terms containing z to the left, all other terms to the right
-2z=-4
z=-4/-2
z=+2
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