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2X - 4 = - 10
add 4 to each side
2X - 4 + 4 = - 10 + 4
2X = - 6
divide each side by 2
X = - 3
check in original equation
2(-3) - 4 = - 10
- 6 - 4 = - 10
- 10 = - 10
checks
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