12x+9y-(12x+8y)=132-(128)

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Solution for 12x+9y-(12x+8y)=132-(128) equation:


Simplifying
12x + 9y + -1(12x + 8y) = 132 + -1(128)
12x + 9y + (12x * -1 + 8y * -1) = 132 + -1(128)
12x + 9y + (-12x + -8y) = 132 + -1(128)

Reorder the terms:
12x + -12x + 9y + -8y = 132 + -1(128)

Combine like terms: 12x + -12x = 0
0 + 9y + -8y = 132 + -1(128)
9y + -8y = 132 + -1(128)

Combine like terms: 9y + -8y = 1y
1y = 132 + -1(128)

Multiply -1 * 128
1y = 132 + -128

Combine like terms: 132 + -128 = 4
1y = 4

Solving
1y = 4

Solving for variable 'y'.

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

Divide each side by '1'.
y = 4

Simplifying
y = 4

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