如图，直线\(y = kx + b\)（\(k \ne 0\)）与\(x\)轴交于点\(\left ( {-4，0} \right )\)，则关于\(x\)的方

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如图，直线\(y = kx + b\)（\(k \ne 0\)）与\(x\)轴交于点\(\left ( {-4，0} \right )\)，则关于\(x\)的方程\(kx + b = 0\)的解为\(x = \)___．

参考答案：\( - 4\)