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x in (-oo:+oo)
(-2/5)*(2*x+3)+(3/7)*x = 3 // - 3
(-2/5)*(2*x+3)+(3/7)*x-3 = 0
(3*x)/7-2/5*(2*x+3)-3 = 0
(-2/5*7*(2*x+3))/7+(3*x)/7+(-3*7)/7 = 0
3*x-2/5*7*(2*x+3)-3*7 = 0
-13/5*x-21-42/5 = 0
-13/5*x-147/5 = 0
(-13/5*x-147/5)/7 = 0
(-13/5*x-147/5)/7 = 0 // * 7
-13/5*x-147/5 = 0
-13/5*x-147/5 = 0 // + 147/5
-13/5*x = 147/5 // : -13/5
x = 147/5/(-13/5)
x = -147/13
x = -147/13
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