Assuming the question is about chemical reactions (rather than mathematics where it is placed), it is a double displacement.
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A linear equation ?
x = (d-a)/(a-c)
ax + by = cThe graph if that equation is a straight line whose slope is (-a/b)and whose y-intercept is (c/b).
ax - b = c ax = b + c x = (b + c)/a
Ax + B = Bx + C Ax - Bx = (C - B) x (A - B) = (C - B) x = (C - B) / (A - B)