Solve {l}{5*1+a/2-3*2+b/2-3=0}{5*c-3*d-3=0}{7*1+c/2-3*2+d/2-5=0}{7*a-3*b-5=0}

$$\left. \begin{array} { l } { 5 \times \frac { 1 + a } { 2 } - 3 \times \frac { 2 + b } { 2 } - 3 = 0 } \\ { 5 \times c - 3 \times d - 3 = 0 } \\ { 7 \times \frac { 1 + c } { 2 } - 3 \times \frac { 2 + d } { 2 } - 5 = 0 } \\ { 7 \times a - 3 \times b - 5 = 0 } \end{array} \right.$$

Solve for a, b, c, d

$$a=-1$$

$$b=-4$$

$$c=3$$

$$d=4$$