4a. 5x = 40°
x = 40°÷5
x = 8°
4b. 7x+25° = 130°
7x = 130° - 25°
7x = 105
× = 105÷7
x = 15°
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4a. 5x = 40°
x = 40°÷5
x = 8°
4b. 7x+25° = 130°
7x = 130° - 25°
7x = 105
× = 105÷7
x = 15°