Answer:
x=17
Explanation:
I hope you understood well !
x = 17
3x + 16 +45 + 68 = 180
3x + 129 = 180
Subtract 129 form both sides
3x + 129 -129 = 180 - 129
3x = 51
Divide both sides by 3
3x/3 = 51/3
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