[{b1: 0, b2: 0, b3: 0, b4: 0, b5: 0, b6: 0, b7: 0}, {b1: b7, b2: b7, b3: b7 *
    (-p1 + 1), b4: b7 * p1, b5: b7, b6: b7, p2: p1}]
Symbolic solution of equation system using Sympy with trivial solutions depending on symbols