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PLS HELP ME ASAP WITH NUMBER 9 THANK YOUU

PLS HELP ME ASAP WITH NUMBER 9 THANK YOUU-example-1

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9a)
4x - 2 + 30 = 68
4x + 28 = 68
4x = 40
x = 10

9b)
y = 180 -68
y= 112
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