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Answer:
x = 21
Step-by-step explanation:
7x - 3 + 2x - 6 = 180 {Linear pair}
7x + 2x - 3 -6 = 180 {combine like terms}
9x - 9 = 180
9x = 180+ 9
9x = 189
x = 189/9
x = 21