Given the equation: x+56=−5 Use proportions rule: From a1/b1 = a2/b2 should a1*b2 = a2*b1, In this case
a1 = 6
b1 = 5 + x
a2 = 1
b2 = -1/5
so we get the equation 5(−1)6=x+5 −56=x+5 Move free summands (without x) from left part to right part, we given: 0=x+531 Move the summands with the unknown x from the right part to the left part: −x=531 Divide both parts of the equation by -1