4x-x等于几

4x-x等于几 4加x等于几 4-3x等于x+1 x等于几 x平方减x减4等于零,x等于几 4x＝x＋6那么x等于几 2x=4-x,x等于几 4x+x²=5.问,x等于几? tanx=4 x等于几 (x-1)(x-2)(x-3)(x-4)=(x+5)(x+6)(x+7)求X等于几? X除以0.25乘4X等于几 5X=4X+2 等于几? 4x的平方等于144,x为几?