3x+5x+4-x+7=88 Combining like terms 3x+5x-x+4+7=88 8x-x+11=88 7x+11=88 Subtract 11 to each side 7x+11-11=88-11 7x=77 Divided 7 to each side 7x/7=77/7 x=11 Check: 3x+5x+4-x+7=88 Substitute x with 11 3(11)+5(11)+4-11+7=88 33+55+4-11+7=88 88+4-11+7=88 92-11+7=88 81+7=88 88=88. As a result, x=11. Hope it help!