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)
(2/3)*x = 5.25 // - 5.25
(2/3)*x-5.25 = 0
2/3*x-5.25 = 0 // + 5.25
2/3*x = 5.25 // : 2/3
x = 5.25/2/3
x = 7.87499996
x = 7.87499996
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