100-30=y

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Solution for 100-30=y equation:


Simplifying
100 + -30 = y

Combine like terms: 100 + -30 = 70
70 = y

Solving
70 = y

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '-1y' to each side of the equation.
70 + -1y = y + -1y

Combine like terms: y + -1y = 0
70 + -1y = 0

Add '-70' to each side of the equation.
70 + -70 + -1y = 0 + -70

Combine like terms: 70 + -70 = 0
0 + -1y = 0 + -70
-1y = 0 + -70

Combine like terms: 0 + -70 = -70
-1y = -70

Divide each side by '-1'.
y = 70

Simplifying
y = 70

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