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Need to know how to find the value of x

Need to know how to find the value of x-example-1
User AndyMM
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a

(5x + 6) + (2x + 21) + 54 + 90 = 360 \\ (collect \: all \: like \: terms) \\ 7x + 171 = 360 \\ 7x = 189 \\ x = 27
User Lycono
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