y=3(x-7)-(3x+7)

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Solution for y=3(x-7)-(3x+7) equation: 


Simplifying
y = 3(x + -7) + -1(3x + 7)

Reorder the terms:
y = 3(-7 + x) + -1(3x + 7)
y = (-7 * 3 + x * 3) + -1(3x + 7)
y = (-21 + 3x) + -1(3x + 7)

Reorder the terms:
y = -21 + 3x + -1(7 + 3x)
y = -21 + 3x + (7 * -1 + 3x * -1)
y = -21 + 3x + (-7 + -3x)

Reorder the terms:
y = -21 + -7 + 3x + -3x

Combine like terms: -21 + -7 = -28
y = -28 + 3x + -3x

Combine like terms: 3x + -3x = 0
y = -28 + 0
y = -28

Solving
y = -28

Solving for variable 'y'.

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

Simplifying
y = -28

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