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Sidana [21]
3 years ago
8

How do you write and solve equation with an unknown number?

Mathematics
1 answer:
Ivanshal [37]3 years ago
8 0
You have to isolate the variable using inverse operations in order to get it alone. Example: x+3=5
Subtract 3 on both sides since you are adding 3, and subtraction is the opposite of addition.
x=2 is your answer. If you check and plug it in, you will see that it is a correct equation.
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Use the drop-down menus to choose steps in order to correctly solve 5(z + 6) – 2 = 9z for z.
shusha [124]
Solve for z:
5 (z + 6) - 2 = 9 z

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Divide both sides of -4 z = -28 by -4:
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(-4)/(-4) = 1:
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(-7)/(-1) = (-1)/(-1)×7 = 7:
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