Solving equations with variable on both sides

 $3\left(b-15\right)=-\left(45-10b\right)$  

 $3\left(2x-6\right)-2\left(4x-3\right)=-2\left(5x-4\right)-\left(4-8x\right)$  

 $12+d=\frac{24}{25}d-13$  

 $2\left(5+2x\right)=x+7+3x+3$  

 $-31-4x=-5-5\left(1+5x\right)$  

A number subtracted from 15 is equal to two-thirds of the number less than 12

3 times the difference of a number and 5 is equal to the product of 2 and, two times the number increased by one

Twice the sum of 3 times a number, and 4 diminished by the difference of 7 times the number, and 10 is equal to 4 times the number subtracted from 3 times the difference of the number and 6

 $Find\ the\ area\ of\ a\ square\ where\ one\ side\ is\ \left(5x+20\right),\ and\ a\ \sec ond\ side\ is\left(\ 7x+14\right)units$  Draw a picture if needed

 $1246\left(198\right)-1246\left(188\right)$