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Answer:
x = 1
Step-by-step explanation:
x - 7 = - 3(x + 1) ← distribute parenthesis by - 3
x - 7 = - 3x - 3 ( add 3x to both sides )
4x - 7 = - 3 ( add 7 to both sides )
4x = 4 ( divide both sides by 4 )
x = 1