If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
x/13 = -0.7 // + 0.7
x/13+0.7 = 0
1/13*x+0.7 = 0 // - 0.7
1/13*x = -0.7 // : 1/13
x = -0.7/1/13
x = -9.09999964
x = -9.09999964
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