Question

Find the value of x.

Answer 1

Explanation:

18x - 12 + 10x + 20 + 15x = 180

43x + 8 = 180

43x = 172

x = 4

Answer 2

the sum of all angles of a triangle is 180

thus,

18x-12+10x+20+15x = 180

43x+8 = 180

43x = 172

x = 172/43

x =4

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