The equation in standard form ax+by=c means we have to get the x and y terms over to the left and the constant over to the right. We also need to get rid of the fraction. First collect the terms into standard position: y+2x/3=-7. Note that the x term has become positive in being transferred to the left. Now multiply the whole equation by 3: 3y+2x=-21. That's now in standard form. The constant happens to be -21.