-4 + x = 7 - x = 11, 5 + x = 12 - x = 7, 9 - x = -3 - x = 12, x + 7 = 15 - x = 8, -18 - x = -8 - x = 10,

Solving + & - One-Step Equations

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?