(x+3)x= x² + 24x² + 3x = x² + 24x² - x² + 3x = 240 + 3x = 24x = 24÷3x = 8
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(x+3)x= x² + 24
x² + 3x = x² + 24
x² - x² + 3x = 24
0 + 3x = 24
x = 24÷3
x = 8