Explanation:
Sum of supplementary angle = 180⁰
2x + 12 + 7x - 3 = 180
9x + 9 = 180
9x = 180 - 7
9x = 171
x = 171/9
x = 19
m<3 = 7(19) - 3 = 133 - 3 = 130⁰
m<4 = 2(19) + 12 = 50⁰
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