Question

Помогите СРОЧНО!!!Даю 15 баллов!

Answer 1

$(2x+1) ^{2} -3(x-5) ^{2}=(x+3)(x-3)\\\\4 x^{2} +4x+1-3( x^{2} -10x+25)= x^{2} -9\\\\4 x^{2} +4x+1-3 x^{2} +30x-75= x^{2} -9\\\\ x^{2} +34x-74= x^{2} -9\\\\34x=65\\\\x=1 \frac{31}{34} \\\\\\ \frac{2x+3}{7}*14- \frac{5x-6}{2} *14=14-14x\\\\4x+6-35x+42=14-14x\\\\-31x+14x=14-48\\\\-17x=-34 \\\\x=2$