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To find the x-intercept of a linear equation, we set y equal to zero and solve for x.
For the equation y = 2x + 10, when y = 0, we have:
0 = 2x + 10
-10 = 2x
x = -5
For the equation y = 3x + 15, when y = 0, we have:
0 = 3x + 15
-15 = 3x
x = -5
Therefore, the common x-intercept for both equations is x = -5.